Whales are a group of mammals that live in oceans. They include some of the largest animals on Earth. The blue whale is the ...

Hippos spend a lot of time in the water, but they can only stay submerged for around 5 minutes at a time ...

Unlike fish, whales can’t breathe underwater. They are mammals ... Life Span Whales have some of the longest lifespans among ...

All can breathe and absorb water through their very ... Some transport water, oxygen, and carbon dioxide either into or out of the animal. Others fight bacteria or fungal infections.

Narrator: Now, most land animals breathe by expanding and contracting ... turtles do this when they're spending long periods of time underwater, like when they're hibernating.

All animals need to take in oxygen and get rid ... allowing the frog to breathe underwater without gills. Grasshoppers are like us flies and other insects. They don’t use their noses or mouths ...

In a study in the journal Science, McKnight and his colleagues report they may have found the answer: Seals can directly perceive how much oxygen is circulating in their body and act accordingly. It's ...