Because of the way we formed from our cousins. Which are primates which is scientifically proven.
Tympanic membranes-- essentially 'eardrums' much like the eardrums deep inside our human ears. Frogs don't have external pinnae (ears) like we do, but you do see their eardrums right there on the side of the head.
Their ears are just a hole on each side of their head, only a few inches back from their eyes...just like a human's ears but they don't have lobes. Geese and ducks will often get water in their ears after swimming and it's pretty funny to watch them try to get the water out...there's a lot of head shaking going on, just a human being!
They have ears. The ears are not visible though, their ears are just holes on the side of their head.
The emu's ears are on either side of its head. Emu ears are not easily visible, being just small holes covered by wispy feathers, amidst the blue skin on the side of their head. See the emu ears at the related weblink below.
Yes, all reptiles have ears. Turtle ears are on the side of their head near the eyes.
most fish usually have two internal ears on each side of their head
Yes. They LOVE ears. Their normal diet from day to day is human ears with a side of fingers
Crickets (and other insects) do not have ears. They have a membrane on the exoskeleton on each side of the head equivalent to an eardrum.
its their ears but they're covered to protect from water
You know by the big or small hole on the side of their head.
The holes positioned on the sides of the head are the gecko's ears canals. Tympanic membranes pick up air born vibrations enabling your gecko to hear.
Sheep's eyes are located on the sides of their heads. They are located up near the ears on other side of the head.