Dinosaurs Behaviour

Dinosaur Quirks

Encephalization Quotients for Modern Mammals

The encephalization quotient (EQs) for some typical mammals are based on the same formula as the dinosaurs: The ratio of the brain to body weight. Here are a few EQs of some well-known mammals:

Mammal Animal Type EQ
Human primate   7.4
Bottlenose dolphin cetacean   5.6
Bluenose dolphin cetacean 5.31
Chimpanzee primate   2.5
Rhesus monkey primate 2.09
Cat carnivore 1.71
Langur primate 1.29
Squirrel rodent 1.10
Rat rodent 0.40


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