Evolution
Giant panda — Bamboo

Giant panda

Bamboo

Gelada — Grass, herbs, roots

Gelada

Grass, herbs, roots

Gorilla — Leaves & fruit

Gorilla

Leaves & fruit

Orangutan — Mostly fruit

Orangutan

Mostly fruit

Howler — Leaves

Canine teeth aren't for meat

Pandas, geladas, gorillas, orangutans and others all have larger canine teeth than humans, and they live almost entirely on plants.

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Water deer — Grass & plants

Water deer

Grass & plants

Colobus — Leaves

Colobus

Leaves

Hippo — Grass

Hippo

Grass

Gibbon — Fruit & leaves

Gibbon

Fruit & leaves