Freshwater

Knifefish

Life in South America, powered by volts

Kaluga Sturgeon

Giant hunter of the Amur

Dimetrodon

Permian sailback-before dinosaurs

Eryops

Permian powerhouse of the ponds

Deinocheirus

The terrible-handed wetland omnivore

Quetzalcoatlus northropi

Largest skies, long-necked hunter

Ornithocheirus

Bird-hand ruler of Cretaceous skies

Purussaurus

Miocene mega-caiman of South America

Allosaurus

Jurassic hunter of the Morrison

Lystrosaurus

The beaked survivor of Earth's worst crisis

Scutosaurus

Permian armor, plant-powered

Pachycephalosaurus

Built like a bipedal battering ram

Palaeoloxodon namadicus

The giant straight-tusked titan of Ice-Age India

Barylambda

Heavyweight of the Paleocene

Hatzegopteryx

Hateg's giant sky-stalker

Teddy Guinea Pig

Plush coat, big squeaks, gentle charm.

Peruvian Guinea Pig

The runway model of guinea pigs

Crayfish

Claws that shape freshwater worlds

Spanish Water Dog

Curly-coated worker: land and water.

Khao Manee

Thailand's White Gem with jewel eyes

Ozark Bass

The Ozarks' star-spotted rock bass

Nutria

Orange teeth, big impact on wetlands

Orinoco Crocodile

Orinoco's long-snouted river giant

Onager

Iran's lightning-footed onager