Bottom row

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European Rabbit
Oryctolagus cuniculus

Comparative brains

Three-toed Sloth
Bradypus sp.

Hoffman's Two-toed Sloth
Choloepus hoffmanni

Philippine Flying Lemur
Cynocephalus volans

Spiny Anteater
Tachyglossus aculeatus

Duck-billed platypus
Ornithohynchus anatinus

Spiny Anteater
Tachyglossus aculeatus

Tree Squirrel
Sciurus everetti

Tree shrew

Eurasian Red Squirrel
Sciurus vulgaris