in order for them to see their prey
Crocodiles have nostrils on the top of their snouts.
This unique eye structure with T-shaped pupils is found in the four-eyed fish (Anableps). These fish have adapted to live near the water's surface, allowing them to simultaneously see above and below the waterline to detect predators and prey.
According to an internet search, crocodiles apparently do not swallow food under water because they would imbibe too much water with the food - and would not necessarily drown. The palatal valve closes off the esophagus and the trachea so water does not flow in. Crocs consume their food at or above the surface of the water.
No, swans have lungs just like you and I and can only breathe air when their heads are above the water.
The organisms living in the water come out for respiration, So crocodile keep its snout out of water while resting for taking in oxygen and give out carbon dioxide.
Approximately 10 of an iceberg is typically visible above the water's surface.
above the water
The upper surface of water is called the water's surface or water level. It is the boundary where the water meets the air above it.
They don't, any aquatic reptile needs to return to the surface to breathe after a while, the only creatures that can breather underwater are fish (and all their variants ie: sharks, stingrays etc)
They have special heads where the nose and eye on top of their flat heads, and keep the head just above the water surface, then they wait for prey to come down for a drink and slowly swim then when close enough lunge at their prey
Because crocodiles have to have water.
Estuarine Crocodiles and Salt Water Crocodiles!