Why do beavers build dams? Is it an instinct thing or necessity?

Question

Why do beavers build dams? Is it an instinct thing or necessity?

In: 2

Answer 1

When speaking of animals instincts are necessities.

In the case of beavers they instinctually build dams to flood areas to build their lodges. This gives them a safe place to sleep and to raise their young that is pretty much inaccessible by most predators