No animal name body.weight brain.weight 1 Lesser Short-tailed Shrew 5 0.14 2 Little Brown Bat 10 0.25 3 Mouse 23 0.30 4 Big Brown Bat 23 0.40 5 Musk Shrew 48 0.33 6 Star Nosed Mole 60 1.00 7 Eastern American Mole 75 1.20 8 Ground Squirrel 101 4.00 9 Tree Shrew 104 2.50 10 Golden Hamster 120 1.00 11 Mole Rate 122 3.00 12 Galago 200 5.00 13 Rat 280 1.90 14 Chinchilla 425 6.40 15 Desert Hedgehog 550 2.40 16 Rock Hyrax (a) 750 12.30 17 European Hedgehog 785 3.50 18 Tenrec 900 2.60 19 Arctic Ground Squirrel 920 5.70 20 African Giant Pouched Rat 1000 6.60 21 Guinea Pig 1040 5.50 22 Mountain Beaver 1350 8.10 23 Slow Loris 1400 12.50 24 Genet 1410 17.50 25 Phalanger 1620 11.40 26 North American Opossum 1700 6.30 27 Tree Hyrax 2000 12.30 28 Rabbit 2500 12.10 29 Echidna 3000 25.00 30 Cat 3300 25.60 31 Artic Fox 3385 44.50 32 Nine-banded Armadillo 3500 10.80 33 Water Opossum 3500 3.90 34 Rock Hyrax (b) 3600 21.00 35 Red Fox 4235 50.40 36 Raccoon 4288 39.20 37 Roe Deer 14830 98.20 38 Goat 27660 115.00 39 Kangaroo 35000 56.00 40 Gray Wolf 36330 119.50 41 Sheep 55500 175.00 42 Giant Armadillo 60000 81.00 43 Gray Seal 85000 325.00 44 Jaguar 100000 157.00 45 Brazilian Tapir 160000 169.00 46 Donkey 187100 419.00 47 Pig 192000 180.00 48 Protoceratops 200000 30.00 49 Okapi 250000 490.00 50 Camptosaurus 400000 46.00 51 Cow 465000 423.00 52 Horse 521000 655.00 53 Giraffe 529000 680.00 54 Stegosaurus 2000000 56.00 55 Allosaurus 2300000 335.00 56 Asian Elephant 2547000 4603.00 57 Anatosaurus 3400000 300.00 58 Iguanodon 5000000 250.00 59 African Elephant 6654000 5712.00 60 Tyrannosaurus 7700000 404.00 61 Triceratops 9400000 140.00 62 Diplodocus 11700000 100.00 63 Blue Whale 58059000 6800.00 64 Brachiosaurus 87000000 309.00