a bird makes a high pitched sound whereas a lion makes a low pitched roar. however, the roar of a lion is cery loud while the sound of the bird is very feeble.why?

This is because the difference in the length of voice box or larynx. A shorter voice box has a larger amplitude and thus produces a high pitched and shirll voice whereas the lion has a larger voice box and thus a shorter amplitude and thus produces a hoarse and heavy voice.

because of the difference in amplitude. the amplitude of roar is more than bird's low pitched voice. And as we know that amplitude is directly proportional to loudness square. So loudness of roar is more