Salamander, Frog, and Polliwog: What Is an Amphibian? (Animal Groups Are CATegorical ™)

What is an amphibian? Frogs, toads, and salamanders and are all amphibians!

• Tortoise, Tree Snake, Gator, and Sea Snake: What Is a Reptile? (Animal Groups Are CATegorical ™)
• Sparrow, Eagle, Penguin, and Seagull: What Is a Bird? (Animal Groups Are CATegorical ™)
• Dolphin, Fox, Hippo, and Ox: What Is a Mammal? (Animal Groups Are CATegorical ™)
• Catfish, Cod, Salmon, and Scrod: What Is a Fish? (Animal Groups Are CATegorical ™)
• Butterfly, Flea, Beetle, and Bee: What Is an Insect? (Animal Groups Are CATegorical ™)
• I'm and Won't, They're and Don't: What's a Contraction? (Words Are CATegorical ®)
• A Second, a Minute, a Week with Days in It: A Book about Time (Math Is CATegorical ®)
• Pre- and Re-, Mis- and Dis-: What Is a Prefix? (Words Are CATegorical ®)
• -Ful and -Less, -Er and -Ness: What Is a Suffix? (Words Are CATegorical ®)
• Pitch and Throw, Grasp and Know: What Is a Synonym? (Words Are CATegorical ®)