Walking

Ruddy Duck

Small duck, big tail attitude

Wood Duck

The tree-nesting duck with a leap

Black-Bellied Whistling Duck

The whistling "tree duck" with style

Northern Pintail

Pointed tail, planet-spanning migrant

Painted Bunting

Nature's living rainbow in the thickets

Least Flycatcher

Hear "che-bek," find the flycatcher.

Panthera atrox (American Lion)

North America's Ice Age lion

Diprotodon

Pleistocene giant of Australia

Thylacoleo carnifex

Australia's "lion" with a marsupial bite

Sivatherium

Shiva's horned giant of giraffids

Epidexipteryx

Display-feather dinosaur of Jurassic China

Gorgosaurus

Laramidia's long-legged tyrant

Hippopotamus gorgops

The high-eyed hippo of deep time

Magyarosaurus

A little titanosaur from an island world

Icadyptes

Eocene giant of Peru's seas

Masiakasaurus

Madagascar's forward-toothed hunter

Cervalces latifrons (Broad-Fronted Moose)

The Pleistocene's broad-browed moose

Haast's Eagle

The moa-hunter of ancient New Zealand

Gastornis

Eocene giant with a powerhouse beak

Thylacosmilus

The saber-tooth that wasn't a cat

Andrewsarchus

Big skull, bigger mystery

Embolotherium

Asia's Eocene battering-ram giant

Dinocrocuta

Not a hyena-just built like one.

Elephant Bird

Madagascar's lost giants of the egg