Question

why can't we hear sounds of all the animals​

Answer 1

Answer:

An animal with a very thick, heavy eardrum doesn't hear high frequencies well because the extra weight prevents fast vibrations. ... The size of the bones in the ear impact an animal's ability to hear; heavy bones don't favor high frequency vibrations, so an animal with heavier bones hears low frequencies well.

Answer 2

Answer:-

The size of the bones in the ear impact an animal's ability to hear; heavy bones don't favor high frequency vibrations, so an animal with heavier bones hear low frequencies well.