Unit 4 vocabulary

An organ used to breathe underwater

• swim bladder

• scales

• gills

• gizzard

A gas-filled bag that helps a fish to float in water

• swim bladder

• scales

• gills

• gizzard

A chamber in an animal's stomach that grinds up food

• swim bladder

• scales

• gills

• gizzard

small, overlapping plates that protect the skin

• swim bladder

• scales

• gills

• gizzard

an animal with a backbone

• ectotherm

• vertebrate

• endotherm

• crop

an animal whose temperature varies with its surroundings; also called cold-blooded

• ectotherm

• vertebrate

• endotherm

• crop

an animal with a constant temperature; also called warm-blooded

• ectotherm

• vertebrate

• endotherm

• crop

a pouch in a bird's digestive system where swallowed food is stored

• ectotherm

• vertebrate

• endotherm

• crop

a cold-blooded vertebrate with scaly skin

• amphibian

• tadpole

• reptile

• fledgling

the immature form of a frog or toad

• amphibian

• tadpole

• reptile

• fledgling