SPECIES BRAIN BODY Quokka 17.5 3.5 Hedgehog 3.5 .93 Tree shrew 3.15 .15 Elephant shrew I 1.14 .049 Elephant shrew II 1.37 .064 Lemur 22 2.1 Slow loris 12.8 1.2 Bush baby 9.9 .7 Howler monkey 54 7.7 Ring-tail monkey 73 3.7 Spider monkey I 114 9.1 Spider monkey II 109 7.7 Gentle lemur 7.8 .22 Rhesus monkey I 84.6 6 Rhesus monkey II 107 8.7 Hamadryas baboon 183 21 Western baboon 179 32 Vervet guenon 67 4.6 Leaf monkey 65.5 5.8 White-handed gibbon 102 5.5 Orangutan 343 37 Chimpanzee 360 45 Gorilla 406 140 Human being 1300 65 Long-nose armadillo 12 3.7 Aardvark 9.6 2.2 Jack rabbit 13.3 2.9 Tree squirrel 6.23 .33 Flying squirrel 1.89 .052 Canadian beaver 40 20 Beaver 45 25 Deer mouse I .68 .027 Deer mouse II .63 .026 Deer mouse III .52 .017 Deer mouse IV .69 .024 Hampster I .67 .036 Hampster II 1.12 .13 Pygmy gerbil 1.04 .065 Rat I .72 .05 Rat II 2.38 .34 House mouse .45 .024 Hopping mouse 1.18 .15 Porcupine I 37 11 Porcupine II 37 14 Porcupine III 24 6.6 Guinea pig 4.28 .97 Capybara 76 30 Agoutis 20.3 2.8 Acouchis 9.9 .78 Chinchilla 5.25 .43 Nutria 23 5 Dolphin 1600 160 Porpoise 537 56 Dog 70.2 8.5 Red fox 48 6 Gray fox 37.3 3.8 Bat-eared fox 28.5 3.2 Grizzly bear 400 250 Beaked whale 500 250 Raccoon 41.6 5.3 Linkajou 31.2 2 Badger 53 6 Domestic cat 28.4 2.5 Lynx 75 12 Leopard 157 46 Lion 260 180 Tiger 302 210 Fur seal 355 250 Sea lion 363 100 Harp seal 442 110 Weddell seal 550 400 African elephant 4480 2800 Hyrax 20.5 3.8 Horse 712 480 Tapir 250 230 Wild boar 185 150 Domestic pig 180 190 Hippopotamus 590 1400 Pygmy hippopotamus 260 150 Llama 225 93 Vicuna 198 45 Barking deer 124 16 Fallow deer 223 80 Axis deer 219 89 Red deer 435 200 Elk 365 120 Sambar 383 120 Caribou 288 110 Eland 480 560 Yak 334 250 Cattle 456 520 Duikers 93 13 Black buck antilope 200 39 Barbary sheep 210 66 Domestic sheep 125 49 Domestic goat 106 30