Why do rabbits have large ears?

Answer 1

Rabbits are very alert so they have large ears to pick up any sound waves that reach it. Rabbits have them mainly for listening if a predator comes near. It's a survival instinct.

Their long ears work the same way as a Sonar. is a technique that uses sound propagation to navigate sounds. If a predator is lurking nearby, the ears hear it and the rabbit flees for safety. It's a survival instinct.

Rabbits have large ears because they have adapted; in the wild, they need to have good hearing to hear any nearby predators. You'll notice how they can control and swivel each ear independantly to listen in different directions. Their eyes similarly cover a great deal of the area around and above them.

Also, rabbits use their ears to control their temperature, so the larger they are, the more efficiently they can lose heat.

So it can be down low in the grass but leave its ears sticking up to hear clearer

also because their ears are thin and they can let the heat out through them.

Rabbits have long ears which can be as long as 10 cm (4 inches)! Scientist Fact!
Rabbits ears are very large to quickly warn them of predators. You will notice that other prey animals, such as deer, often have large ears for the same purpose.
Rabbits are very alert so they have large ears to pick up any sound waves that reach it. Rabbits have them mainly for listening if a predator comes near. It's a survival instinct.

Answer 2

So that they can hear predators coming and hear if something is safe like a birds' call.