English Dictionary

marine mammal

noun

A mammal which lives wholly in seawater, such as whales and dolphins, or that is restricted to coastal habitats and feeds on marine life, such as seals, sea cows, polar bears, and sea otters.

The dolphin is a marine mammal.

意味（1）

A mammal which lives wholly in seawater, such as whales and dolphins, or that is restricted to coastal habitats and feeds on marine life, such as seals, sea cows, polar bears, and sea otters.

The influence of the temperature of the Gulf-stream upon animal life in the ocean is very curious. The whale so sedulously shuns its warm waters, as almost to indicate their track by its absence ; while yet abundantly found on each side of it. The physical reasons are doubtless the same which prevent this great marine mammal from ever crossing the equator from one hemisphere to the other — a fact now well ascertained.