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