Freshwater

Limpet

Cling hard, graze smart, ride the tide.

Ostracod

Tiny shells, huge history

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