General

How Do Lions Say I Love You?:

Once upon a Mastodon: All About Prehistoric Mammals

Safari, So Good!: All About African Wildlife

Baby Animals:

Penguins and Antarctica: A Nonfiction Companion to Magic Tree House #40: Eve of the Emperor Penguin

Sabertooths and the Ice Age: A Nonfiction Companion to Magic Tree House #7: Sunset of the Sabertooth

Busy Birdies:

Mama's Milk / Mamá me alimenta:

Eric Carle's Animals Animals:

Chickens Aren't the Only Ones: A Book About Animals that Lay Eggs

Fake Out!: Animals That Play Tricks

Why Dogs Eat Poop: Gross but True Things You Never Knew About Animals