Kangaroos are not half dolphins.
With their lungs rather than through their lungs, but yes - both dolphins and kangaroos breathe with lungs.
None. There are no porpoises in Australian waters. Dolphins are plentiful, but not porpoises.
Yes
When the sleep their brain is half awake so it can breathe
Mammal is an animal classification. It includes animals such as dogs, cats, horses, kangaroos, dolphins and whales.
are you actually kidding me????????
That is Ricky Williams.
Yes, they do; the sub-class Eutheria (placental mammals) includes all orders of mammals except monotremes (platypuses and echidnas) and marsupials (opossums, kangaroos, etc.). Cetaceans (whales, dolphins and porpoises) are included.
They're not different. All dolphins (and whales for that matter) have half their brain sleeping and half their brain awake at all times. This is so they can go to the surface to breath and are not caught off guard by predators.
Bottle nose dolphins do sleep but in a weird kind of way. Half of there brains sleep while the other half keeps swimming for air.
pigs whales horses dogs hippos koalas kangaroos tigers kackatoos and dolphins and spongebob no pants live in greece.
Dolphins only sleep using half of their brain at a time, so they will still be above water and conscious of what they are doing when half of their brain is asleep, so they will still be breathing