No, they can't. No mammals can except plataypuses.
No, no mammals don't have gills, and can't breathe under water. Mammals have lungs, breathe air and have to hold their breath when diving.
No mammals can breathe underwater. All mammals, including sea mammals, must breathe above the surface of the water. This is why marine mammals such as dolphins and whales frequently come to the surface.
mammals cant breathe underwater only some of them like a beaver and the family...
No, mammals don't have gills, and can't breathe under water. Mammals have lungs, breathe air and have to hold their breath when diving.
They don't. Their mammals!
Otters can't breathe under water. They're mammals, they breathe air, with lungs. When they dive, they hold their breath.
No, hippos are mammals. Therefore, they have lungs and need to breathe air to survive.
Orcas - killer whales don't Breathe under water. They are mammals and Breathe air with lungs. They hold their breath when diving.
No, they must surface to breathe, as they have lungs like all mammals.
Mammals don't breathe under water. They hold their breath like you or I would...except their lungs are gigantic and they can hold their breath for hours. No they don't. Whales are mammals and thus need to breathe like most mammals do. In order to breathe, whales have blow holes on their heads. They come up to the surface of the water, bring their blow hole out of the water, open it and take in air, and then go back under water again. No basically.
Narwhals are whales, and whales are considered mammals, and mammals can't breathe underwater. Therfore, a narwhal must breathe air to prevent from drowning, and to do so, they (and all the other kinds of sea mammals) must swim up to the surface every few minutes to breathe air.
Dolphins can't breathe underwater because they are mammals. They go to the surface to breathe and then hold their breath while underwater