The animal that spends most of its life in trees would have to be the sloth.
Cow
Hippopotamus
A penguin is a flightless bird that spends most of its life in the ocean. They are known for their black and white plumage and their unique waddling walk on land. Penguins are found in the Southern Hemisphere, with species living in Antarctica, South America, Africa, and Australia.
Jellyfish spend most of their life as a medusa, the umbrella-shaped adult form, while in their life cycle. Medusae are the free-swimming, bell-shaped form of jellyfish that you typically see in the ocean.
Sloths live in trees and spend most of their life asleep, but tend to venture when they can be bothered :)
Cow
Whale
Most mammals rely on trees for living space and food. Insects use them for camoflauge. While birds use them to keep their nests from harm.
The mole is a small, burrowing animal that spends most of its life underground. They are typically grey, greyish-brown, or black.
arboreal means it spends most of its time on trees
The ground. They rarely fly and at night they go in the trees to roost.
A marine animal is a "marine" animal because it spends most of it's life in a marine environment (ex. the ocean). These could be marine animals like conchs, seastars, fish, or marine mammals like dolphins and whales.
hippopotamus
In water, on land, or in it's shell.
An Albatross - is a large sea-bird, that spends most of its life flying.
a seahorse lol
The desert tortoise spends most of its life underground in a burrow.