Brains, innovations and evolution in birds and primates

Brain, Behavior and Evolution

Volumn 63, Issue 4, 2004, Pages 233-246

  Lefebvre, Louis ^a   Reader, Simon M ^a   Sol, Daniel ^a  

^a MCGILL UNIVERSITY   (Canada)

Author keywords

Birds; Brain evolution; Hyperstriatum ventrale; Innovation; Invasion biology; Isocortex; Neostriatum; Primates; Tool use

Indexed keywords

ANIMAL BEHAVIOR; BIRD; BRAIN MATURATION; BRAIN SIZE; CONFERENCE PAPER; CORPUS STRIATUM; EVOLUTIONARY RATE; HYPOTHESIS; LEARNING; MOLECULAR EVOLUTION; NEOSTRIATUM; NEUROBIOLOGY; NONHUMAN; OLFACTORY CORTEX; PRIMATE; PRIORITY JOURNAL; SEASONAL VARIATION; SPECIES DIFFERENCE; SPECIES IDENTIFICATION; TAXON;

ANIMALS; BIRDS; BRAIN; EVOLUTION; PRIMATES;

AVES; PRIMATES;

EID: 1842829985     PISSN: 00068977     EISSN: None     Source Type: Journal    
DOI: 10.1159/000076784     Document Type: Conference Paper

References (154)

1. Aiello L, Wheeler P (1995) The expensive-tissue hypothesis: the brain and the digestive system in human and primate evolution. Curr Anthropol 36:199-221.
2. Alp R (1997) 'Stepping-sticks' and 'seat-sticks': new types of tools used by wild chimpanzees (Pan troglodytes) in Sierra Leone. Am J Primatol 41:45-52.
3. Armstrong E (1983) Relative brain size and metabolism in mammals. Science 220:1302-1304.
4. Baker AJ, Moeed A (1987) Rapid genetic differentation and founder effects in colonizing populations of common mynas (Acridotheres tristis). Evolution 41:525-538.
5. Balda RP, Kamil AC (1989) A comparative study of cache recovery by three corvid species. Anim Behav 38:486-495.
6. Bandura A (1977) Social Learning Theory. New Jersey: Prentice-Hall.
7. Barton R (1999) The evolutionary ecology of the primate brain. In: Comparative Primate Socioecology (Lee PC, ed), pp 167-194. Cambridge UK: Cambridge University Press.
8. Barton RA (1996) Neocortex size and behavioural ecology in primates. Proc R Soc Lond B 263:173-177.
9. Barton RA, Dunbar RIM (1997) Evolution of the social brain. In: Machiavellian Intelligence II (Whiten A, Byrne RW, eds), pp 240-263. Cambridge UK: Cambridge University Press.
10. Barton RA, Harvey PH (2000) Mosaic evolution of brain structure in mammals. Nature 405:1055-1058.
11. Basil JA, Kamil AC, Balda RP, Fite KV (1996) Differences in hippocampal volume among food storing corvids. Brain Behav Evol 47:156-164.
12. Beck BB (1980) Animal Tool Behavior: The Use and Manufacture of Tools by Animals. New York: Garland.
13. Bennett PM, Harvey PH (1985b) Brain size, development and metabolism in birds and mammals. J Zool 207:491-509.
14. Bennett PM, Harvey PH (1985a) Relative brain size and ecology in birds. J Zool 207:151-169.
15. Bennett PM, Owens IPF (2002) Evolutionary Ecology of Birds: Life Histories, Mating Systems and Extinction. Oxford UK: Oxford University Press.
16. Boire D (1989) Comparaison quantitative de l'encéphale, de ses grandes subdivisions et de relais visuels, trijumaux et acoustiques chez 28 espèces d'oiseaux. PhD dissertation, Université de Montréal, Montréal, Canada.
17. Bolhuis JJ, Macphail EM (2001) A critique of the neuroecology of learning and memory. Trends Cogn Sci 5:426-433.
18. Boswall J (1977) Tool-using by birds and related behaviour. Avicult Mag 83:88-97, 146-159, 220-228.
19. Boswall J (1978) Further notes on tool-using in birds and related behaviour. Avicult Mag 84:162-166.
20. Boswall J (1983a) Tool-using and related behaviour in birds: more notes. Avicult Mag 89:94-108.
21. Boswall J (1983b) Tool-using and related behaviour in birds: yet more notes. Avicult Mag 89:170-181.
22. Bouchard J (2002) Is social learning correlated with innovation in birds? An inter-and an interspecific test. M.Sc. dissertation, McGill University, Montreal, Canada.
23. Box HO, Gibson KR (eds) (1999) Mammalian Social Learning: Comparative and Ecological Perspectives. Cambridge UK: Cambridge University Press.
24. Byrne RW (1993) Do larger brains mean greater intelligence? Behav Brain Sci 16:696-697.
25. Byrne RW, Whiten A (1990) Tactical deception in primates: the 1990 data-base. Primate Rep 27:1-101.
26. Child P (1978) Yellowhead not entirely insectivorous. Notornis 25:252-253.
27. Clutton-Brock TH, Harvey PH (1980) Primates, brain and ecology. J Zool Lond 190:309-323.
28. Day LB, Crews D, Wilczynski W (1999a) Relative medial and dorsal cortex volume in relation to foraging ecology in congeneric lizards. Brain Behav Evol 54:314-322.
29. Day LB, Crews D, Wilczynski W (1999b) Spatial and reversal learning in congeneric lizards with different foraging strategies. Anim Behav 57:393-407.
30. De Winter W, Oxnard CE (2001) Evolutionary radiations and convergences in the structural organization of mammalian brains. Nature 409:710-714.
31. Deaner RO, Nunn CL, van Schaik CP (2000) Comparative tests of primate cognition: different scaling methods produce different results. Brain Behav Evol 55:44-52.
32. Deng C, Rogers LJ (1997) Differential contributions of the two visual pathways to functional lateralization in chicks. Behav Brain Res 87:173-182.
33. DeVoogd TJ, Krebs JR, Healy SD, Purvis A (1993) Relations between song repertoire size and the volume of brain nuclei related to song: Comparative evolutionary analyses amongst oscine birds. Proc R Soc Lond B 254:75-82.
34. DeVoogd TJ (2004) Neural constraints on the complexity of avian song. Brain Behav Evol 63:221-232.
35. Dubbeldam JL (1998) Birds. In: The Central Nervous System of Vertebrates (Nieuwenhuys R, TenDonkelaar HJ, Nicholson C, eds), pp 1525-1620. Berlin: Springer Verlag.
36. Dunbar RIM (1992) Neocortex size as a constraint on group size in primates. J Hum Evol 20:469-493.
37. Dunbar RIM (1995) Neocortex size and group size in primates: a test of the hypothesis. J Hum Evol 28:287-296.
38. Dunbar RIM (1998) The social brain hypothesis. Evol Anthropol 6:178-190.
39. Dunbar RIM, Bever J (1998) Neocortex size determines group size in carnivores and some insectivores. Ethology 104:695-708.
40. Eisenberg JF, Wilson DE (1978) Relative brain size and feeding strategies in the chiroptera. Evolution 32:740-751.
41. Felsenstein J (1985) Phylogenies and the comparative method. Am Nat 125:1-15.
42. Finlay BL, Darlington RB (1995) Linked regularities in the development and evolution of mammalian brains. Science 268:1578-1584.
43. Finlay BL, Darlington RB, Nicastro N (2001) Developmental structure in brain evolution. Behav Brain Sci 24:263-308.
44. Fisher J, Hinde RA (1949) The opening of milk bottles by birds. Brit Birds 42:347-357.
45. Fragaszy DM, Perry S (eds) (2003) The Biology of Traditions: Models and Evidence. Cambridge UK: Cambridge University Press.
46. Gittleman JL (1986) Carnivore brain size, behavioural ecology, and phylogeny. J Mammal 67:23-36.
47. Gittleman JL (1994) Female brain size and parental care in carnivores. Proc Nat Acad Sci USA 91:5495-5497.
48. Gossette RL (1968) Examination of retention decrement explanation of comparative successive discrimination reversal learning by birds and mammals. Percept Motor Skills 27:1147-1152.
49. Gould-Beierle KL (2000) A comparison of four corvid species in a working and reference memory task using a radial maze. J Comp Psychol 114:347-356.
50. Hampton RR, Sherry DF, Shettleworth SJ, Khurgel M, Ivy G (1995) Hippocampal volume and food-storing behaviour are related in parids. Brain Behav Evol 45:54-61.
51. Hansell MH (1984) Animal Architecture and Building Behaviour. London: Longman.
52. Harvey PH, Clutton-Brock TH, Mace GM (1980) Brain size and ecology in small mammals and primates. Proc Nat Acad Sci USA 77:4387-4389.
53. Harvey PH, Pagel MD (1991) The Comparative Method in Evolutionary Biology. Oxford UK: Oxford University Press.
54. Healy SD, Hurly TA (2004) Spatial learning and memory in birds. Brain Behav Evol 63:211-220.
55. Healy SD, Krebs JR (1992) Food storing and the hippocampus in corvids: amount and volume are correlated. Proc R Soc Lond B 248:241-245.
56. Healy SD, Krebs JR (1996) Food storing and the hippocampus in Paridae. Brain Behav Evol 47:195-199.
57. Hendry AP, Wenburg JK, Bentzen P, Volk EC, Quinn TP (2000) Rapid evolution of reproductive isolation in the wild: evidence from introduced salmon. Science 290:516-518.
58. Heyes CM, Galef BG, Jr. (1996) Social Learning in Animals: The Roots of Culture. London UK: Academic Press.
59. Horn G (1990) Neural bases of recognition memory investigated through an analysis of imprinting. Phil Trans R Soc Lond B 329:133-142.
60. Huber R, van Staaden MJ, Kaufman LS, Liem KF (1997) Microhabitat use, trophic patterns, and the evolution of brain structure in African cichlids. Brain Behav Evol 50:167-182.
61. Iwaniuk A, Nelson J, Pellis S (2001) Do big-brained animals play more? J Comp Psychol 115:29-41.
62. Jacobs LF, Spencer WD (1994) Natural space-use patterns and hippocampal size in kangaroo rats. Brain Behav Evol 44:125-132.
63. Jacobs LF, Gaulin SJC, Sherry DF, Hoffman GE (1990) Evolution of spatial cognition: sex-specific patterns of spatial behavior predict hippocampal size. Proc Nat Acad Sci USA 87:6349-6352.
64. Jansson C, Ekman J, von Brömssen A (1981) Winter mortality and food supply in tits Parus spp. Oikos 37:313-322.
65. Jerison HJ (1973) Evolution of the Brain and Intelligence. New York: Academic Press.
66. Johnston TD (1981) Contrasting approaches to a theory of learning. Brain Behav Sci 4:125-173.
67. Johnston TD (1982) The selective costs and benefits of learning: an evolutionary analysis. Adv Study Behav 12:65-106.
68. Jolicoeur P, Pirlot P, Baron G, Stephan H (1984) Brain structure and correlation patterns in insectivora, chiroptera, and primates. Syst Zool 33:14-29.
69. Kaas JH (1995) The evolution of isocortex. Brain Behav Evol 46:187-196.
70. Kaas JH (2002) Convergences in the modular and areal organization of the forebrain of mammals: implications for the reconstruction of forebrain evolution. Brain Behav Evol 59:262-272.
71. Kabai P (2001) Modular evolution of avian brain areas. Behaviour plasticity in birds. Hungarian Acad Sci Budapest.
72. Kamil AC (1988) A synthetic approach to the study of animal intelligence. In: Comparative Perspectives in Modern Psychology. Nebraska Symposium of Motivation (Volume 35) (Leger DW, ed), pp 257-388. Lincoln, NB: University of Nebraska Press.
73. Karten HJ, Hodos W, Nauta WJH, Revzin AM (1973) Neural connections of the 'visual Wulst' of the avian telencephalon. Experimental studies in the pigeon and owl. Comp Neurol 150:253-278.
74. Kawai M (1965) Newly-acquired pre-cultural behavior of the natural troop of Japanese monkeys on Koshima Islet. Primates 6:1-30.
75. Krebs JR, Sherry DF, Healy SD, Perry H, Vaccerino AL (1989) Hippocampal specialization of food-storing birds. Proc Nat Acad Sci USA 86:1388-1392.
76. Kudo H, Dunbar RIM (2001) Neocortex size and social network size in primates. Anim Behav 62:711-722.
77. Laland KN, Reader SM (1999) Foraging innovation in the guppy. Anim Behav 57:331-340.
78. Lee P (1991) Adaptations to environmental change: An evolutionary perspective. In: Primate Responses to Environmental Change (Box HO, ed), pp 39-56. London UK: Chapman and Hall.
79. Lefebvre L (2000) Feeding innovations and their cultural transmission in bird populations. In: The Evolution of Cognition (Heyes C, Huber L, eds), pp 311-328. Cambridge MA: MIT Press.
80. Lefebvre L, Bolhuis JJ (2003) Positive and negative correlates of feeding innovations in birds: evidence for limited modularity. In: Animal Innovation (Reader SM, Laland KN, eds), pp 40-61. Oxford UK: Oxford University Press.
81. Lefebvre L, Giraldeau L-A (1996) Is social learning an adaptive specialization? In: Social Learning in Animals: the Roots of Culture (Heyes CM, Galef, Jr BG, eds), pp 107-128. London UK: Academic Press.
82. Lefebvre L, Gaxiola A, Dawson S, Timmermans S, Rosza L, Kabai P (1998) Feeding innovations and forebrain size in Australasian birds. Behaviour 135:1077-1097.
83. Lefebvre L, Juretic N, Timmermans S, Nicolakakis N (2001) Is the link between forebrain size and feeding innovations caused by confounding variables? A study of Australian and North American birds. Anim Cog 4:91-97.
84. Lefebvre L, Nicolakakis N, Boire D (2002) Tools and brains in birds. Behaviour 139:939-973.
85. Lefebvre L, Whittle P, Lascaris E, Finkelstein A (1997) Feeding innovations and forebrain size in birds. Anim Behav 53:549-560.
86. Lynch M (1990) The rate of morphological evolution in mammals from the standpoint of the neutral expectation. Am Nat 136:727-741.
87. Mace GM, Harvey PH, Clutton-Brock TH (1981) Brain size and ecology in small mammals. J Zool Lond 193:333-354.
88. Macphail EM (1976) Effects of hyperstriatal lesions on within-day serial reversal performance in pigeons. Physiol Behav 16:529-536.
89. Macphail EM (1982) Brain and Intelligence in Vertebrates. Oxford UK: Clarendon Press.
90. Macphail EM (1985) Vertebrate intelligence: the null hypothesis. Phil Trans R Soc Lond B 308:37-51.
91. Macphail EM, Bolhuis JJ (2001) The evolution of intelligence: adaptive specializations versus general process. Biol Rev 76:341-364.
92. Macphail EM, Reilly S, Good M (1993) Lateral hyperstriatal lesions disrupt simultaneous, but not successive conditional discrimination learning of pigeons (Columba livia). Behav Neurosci 107:289-298.
93. Madden J (2001) Sex, bowers and brains. Proc R Soc Lond B 268:833-838.
94. Marino L (1996) What can dolphins tell us about primate evolution? Evol Anthropol 5:81-88.
95. Martin PR, Bateson P (1993) Measuring Behaviour: An Introductory Guide, 2nd edition. Cambridge UK: Cambridge University Press.
96. McCabe BJ, Cipolla-Neto J, Horn G, Bateson PPG (1982) Amnesic effects of bilateral lesions placed in the hyperstriatum ventrale of the chick after imprinting. Exp Brain Res 45:13-21.
97. McLaughlin JF, Hellmann JJ, Boggs CL, Ehrlich PR (2002) Climate change hastens population extinctions. Proc Nat Acad Sci USA 99:6070-6074.
98. Mezzey S, Szekely AD, Bourne RC, Kabai P, Csillag A (1999) Changes in binding to muscarinic and nicotinic cholinergic receptors in the chick telencephalon following passive avoidance learning. Neurosci Lett 270:75-78.
99. Mlikovsky J (1989a) Brain size in birds: 1. Tinamiformes through ciconiiformes. Vest Cs Spolec Zool 53:33-47.
100. Mlikovsky J (1989b) Brain size in birds: 2. Falconiformes through gaviiformes. Vest Cs Spolec Zool 53:200-213.
101. Mlikovsky J (1989c) Brain size in birds: 3. Columbiformes through piciformes. Vest Cs Spolec Zool 53:252-264.
102. Mlikovsky J (1990) Brain size in birds: 4. Passeriformes. Acta Soc Zool Bohemoslov 54:27-37.
103. Nealen PM, Ricklefs RE (2001) Early diversification of the avian brain:body relationship. J Zool 253:391-404.
104. Nicolakakis N, Lefebvre L (2000) Forebrain size and innovation rate in European birds: feeding, nesting and confounding variables. Behaviour 137:1415-1429.
105. Nicolakakis N, Lefebvre L, Sol D (2003) Behavioural flexibility predicts species richness in birds, but not extinction risk. Anim Behav 5:445-452.
106. Nottebohm F (1981) A brain for all seasons: cyclical anatomical changes in song control nuclei of the canary brain. Science 214:1368-1370.
107. Nottebohm F, Alvarez-Buylla A, Ccynx JK, Ling CY, Nottebohm M, Suter R, Tolles A, Williams H (1990) Song learning in birds: the relation between perception and production. Phil Trans R Soc Lond 329:115-124.
108. Oda R (1996) Predation on a chameleon by a ringtailed lemur (Lemur catta) in the Berenty Reserve, Madagascar. Folia Primatol 67:40-43.
109. Owens IPF, Bennett PM (2000) Ecological basis of extinction risk in birds: Habitat loss versus human persecution and introduced predators. Proc Nat Acad Sci USA 97:12144-12148.
110. Parent A (1986) Comparative Neurobiology of the Basal Ganglia. New York: John Wiley and Sons.
111. Plowright CMS, Reid S, Kilian T (1998) Finding hidden food: behavior on visible displacement tasks by mynahs (Gracula religiosa) and pigeons (Columba livia). J Comp Psychol 112:13-25.
112. Portmann A (1947) Etude sur la cérébralisation chez les oiseaux II. Alauda 15:1-15.
113. Powell RW (1974) Comparison of differential reinforcement of low rates (DRL) performance in pigeons (Columba livia) and crows (Corvus brachyrhynchos). J Comp Physiol Psychol 86:736-746.
114. Purvis A, Rambaut A (1995) Comparative analysis by independent contrasts (CAIC): an Apple Macintosh application for analysing comparative data. Comp Appl Biosci 11:247-251.
115. Purvis A, Webster AJ (1999) Phylogentically independent comparisons and primate phylogeny. In: Comparative Primate Socioecology (Lee PC, ed), pp 44-70. Cambridge UK: Cambridge University Press.
116. Rachlin H (1981) Learning theory in its niche. Behav Brain Sci 4:155-156.
117. Reader SM (2003) Relative brain size and the distribution of innovation and social learning across the nonhuman primates. In: The Biology of Traditions: Models and Evidence (Fragaszy DM, Perry S, eds), pp 56-93. Cambridge UK: Cambridge University Press.
118. Reader SM, Laland KN (2001) Primate innovation: sex, age and social rank differences. Int J Primatol 22:787-805.
119. Reader SM, Laland KN (2002) Social intelligence, innovation and enhanced brain size in primates. Proc Nat Acad Sci USA 99:4436-4441.
120. Reboreda JC, Clayton NS, Kacelnik A (1996) Species and sex differences in hippocampus size in parasitic and non-parasitic cowbirds. Neuro-Report 7:505-508.
121. Rehkämper G, Zilles K (1991) Parallel evolution in mammalian and avian brains: comparative cytoarchitectonic and cytochemical analysis. Cell Tissue Res 263:3-28.
122. Rehkämper G, Frahm HD, Zilles K (1991) Quantitative development of brain and brain structure in birds (Galliformes and Passeriformes) compared to that in mammals (insectivores and primates). Brain Behav Evol 37:125-143.
123. Rehkämper G, Zilles K, Schleicher A (1985) A quantitative approach to cytoarchitectonics. X. The areal pattern of the neostriatum in the domestic pigeon, Columba livia f.d. A cyto-and myeloarchitectonic study. Anat Embryol 171:345-355.
124. Reiner A, Brauth SE, Karten HJ (1984) Evolution of the amniote basal ganglia. Trends Neurosci 7:320-325.
125. Ricklefs RE (1998) Avian Growth and Development: Evolution within the Altricial-Precocial Spectrum. New York: Oxford University Press.
126. Riddell WI (1979) Cerebral indices and behavioral differences. In: Development and Evolution of Brain Size: Behavioral Implications (Hahn ME, Jenson C and Dudek BC, eds), pp 89-109. New York: Academic Press.
127. Riddell WI, Corl KG (1977) Comparative investigation of the relationship between cerebral indices and learning abilities. Brain Behav Evol 14:385-398.
128. Robinson BW, Dukas R (1999) The influence of phenotypic modifications on evolution: the Baldwin effect and modern perspectives. Oikos 85:582-589.
129. Sasvàri L (1979) Observational learning in great, blue and marsh tits. Anim Behav 27:767-771.
130. Sasvàri L (1985) Different observational learning capacity in juvenile and adult individuals of congeneric bird species. Z Tierpsychol 69:293-304.
131. Seyfarth RM, Cheney DL (2002) What are big brains for? Proc Nat Acad Sci USA 99:4141-4142.
132. Sherry DF, Schacter DL (1987) The evolution of multiple memory systems. Psychol Rev 94:439-454.
133. Sherry DF, Vaccarino AL, Buckenham K, Herz RS (1989) The hippocampal complex of food-storing birds. Brain Behav Evol 34:308-317.
134. Shimizu T, Cox K, Karten HJ (1995) Intratelencephalic projections of the visual wulst in pigeons (Columba livia). J Comp Neurol 359:551-572.
135. Shimizu T, Hodos W (1989) Reversal learning in pigeons: effects of selective lesions of the wulst. Behav Neurosci 103:262-272.
136. Sibley GC, Alquist JE (1990) Phylogeny and Classification of Birds: A Study in Molecular Evolution. New Haven CT: Yale University Press.
137. Sol D (2003) Behavioural flexibility: a neglected issue in the ecological and evolutionary literature? In: Animal Innovation (Reader SM, Laland KN, eds), pp 63-82. Oxford UK: Oxford University Press.
138. Sol D, Lefebvre L (2000) Behavioural flexibility predicts invasion success in birds introduced to New Zealand. Oikos 90:599-605.
139. Sol D, Lefebvre L, Timmermans S (2002) Behavioural flexibility and invasion success in birds. Anim Behav 63:495-502.
140. Stephan H, Baron G, Frahm H (1988) Comparative size of brain and brain components. In: Comparative Primate Biology, vol. 4, Neuroscience (Erwin J, Steklis HD, eds), pp 1-38. New York: Liss.
141. Stephan H, Frahm H, Baron G (1981) New and revised data on volumes of brain structure in insectivores and primates. Folia Primatol 35:1-29.
142. Stewart MG, Kabai P, Harrison E, Steele RJ, Kossut M, Csillag A (1996) The involvement of dopamine in the striatum in passive avoidance training in the chick. Neuroscience 70:7-14.
143. Thorndike EL (1911) Animal Intelligence. New York: Macmillan.
144. Timmermans S (1999) Opportunism and the neostriatal/ hyperstriatum ventrale complex in birds. M.Sc. dissertation, McGill University, Montréal, Canada.
145. Timmermans S, Lefebvre L, Boire D, Basu P (2000) Relative size of the hyperstriatum ventrale is the best predictor of feeding innovation rate in birds. Brain Behav Evol 56:196-203.
146. Waldmann C, Güntürkün O (1993) The dopaminergic innervation of the pigeon caudolateral forebrain - immunocytochemical evidence for a prefrontal cortex in birds. Brain Res 600:225-234.
147. Webster SJ, Lefebvre L (2001) Problem solving and neophobia in a Columbiforme - Passeriforme assemblage in Barbados. Anim Behav 62:23-32.
148. Whiten A, Byrne RW (1988) Tactical deception in primates. Behav Brain Sci 11:233-273.
149. Wilson B, Boakes RA (1985) A comparison of the short-term memory performances of pigeons and jackdaws. Anim Learn Behav 13:285-290.
150. Wilson B, Mackintosh NJ, Boakes RA (1985) Transfer of relational rules in matching and oddity learning by pigeons and corvids. Q J Exp Psychol 37B:313-332.
151. Wyles JS, Kunkel JG, Wilson AC (1983) Birds, behaviour, and anatomical evolution. Proc Nat Acad Sci USA 80:4394-4397.
152. Young HG (1987) Herring gull preying on rabbits. Brit Birds 80:630.
153. Zentall TR, Galef BG, Jr. (eds) (1988) Social Learning: Psychological and Biological Perspectives. Hillsdale NY: Erlbaum.
154. Zilles K, Rehkämper G (1988) The brain, with special reference to the telencephalon. In: Orang-Utan Biology (Schwartz JH, ed), pp 157-176. Oxford UK: Oxford University Press.