Sound waves travel very well in water. Warships, including submarines, use passive sonar to listen for enemy ships and submarines. Passive sonar employes underwater hydrophones to listen for sounds. They can detect sounds of ships and submarines miles away. Marine mamals such as whales and dolphins detect sound in much the same way.
The border between water and air.
Dolphins do not construction homes, and only "live" in familiar patches of water that they regularly migrate between.
dolphins can not stay in water long time like most aquatic animals
The radio waves are quickly absorbed by water, specially salted water. So instead, sonar waves are used. This is what the dolphins use to communicate underwater. In documentaries on TV, you can hear a fast ticking noise when they're filming dolphins.
Pink dolphins need water because they are dolphins.
Most fish always have to stay in water. Dolphins come up to the ocean surface for a breath of hair. Dolphins breathe through their blowhole.
sound can be produced in any medium - air, water and solids too, but most of the sounds we hear are through air. Animals like dolphins produce sound in water and hear it there.
Dolphins live in the sea water, but do not drink it. The ocean water is too salty for the dolphins system to handle.
There are slightly over 30 species of dolphins in the world. Including fresh water dolphins and salt water dolphins.
Dolphins sleep near the surface. They sleep in the water.
Dolphins communicate under water by using echolocation
Ok for one thing dolphins don't have to be in water! dolphins are mammal.So is the killer whale