Which is a common adaptation for mammals in aquatic environment?

Here are some common adaptations for mammals in aquatic environments:

* Streamlined body shape: This reduces drag and makes swimming more efficient. Think of dolphins, seals, and whales.

* Flippers or webbed feet: These act as paddles for propulsion through the water.

* Thick layer of blubber or fur: Provides insulation against cold water temperatures.

* Nostrils located on top of the head: Allows the animal to breathe while keeping most of its body submerged.

* Ability to hold their breath for extended periods: Necessary for diving and foraging in deep water.

* Modified lungs: Some aquatic mammals have lungs that can collapse to minimize buoyancy.

* Salt glands: These help to excrete excess salt that is ingested from seawater.

* Flukes or tails: Powerful tails used for propulsion in some aquatic mammals.

These are just a few examples, and the specific adaptations will vary depending on the species and the specific environment it inhabits.