Terrapin

Example:The bird's wings were spread wide as it flew over the field.

Definition:A warm-blooded egg-laying vertebrate distinguished by having feathers, two wings (in most species), and a beak.

Example:The fish leaped out of the water to catch a flying insect.

Definition:An animal that lives in water and has gills to breathe, no legs, and a streamlined body. Not a direct antonym to terrapin but opposite in habitat and biology.