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Why human's eyes are in front and not on sides like birds?
Answer 1:

Birds can see better what's happening on their sides than we can. They have a much wider field of view than ours. Also, when a bird wants to see something interesting on one side, it will tip its head to that side to see just with the eye on that side. Our cockatoo did that, and it was pretty entertaining.

Wikipedia has an article about 'bird vision' that says most birds can't move their eyes. Most birds have eyes on the sides of their heads, but some birds like owls have eyes on the front of their heads, like us. Owls can see in 3D, like we do; but birds with eyes on the sides of their heads can't see in 3D. Birds can see fast movement better than we can, though. Fluorescent lights flicker 60 times per second, and chickens can see all those flashes, but we can't. Wikipedia says birds can see slow movement better than we can, too, like the sun moving across the sky.

Science answers 'How' questions mostly, not 'Why' questions. Somehow we evolved with eyes in front so that we can see in 3D and know how far away things are. Owls do this, too, and it probably helps them know how far away their prey is. [That's a 'Why' answer, but it's just a guess.]

This is interesting, from Wikipedia's article on 'binocular vision.' It says animals with eyes on the sides of their heads are often the ones that get hunted, like rabbits. They want to be able to see as big a field of view as possible, to see if anything is hunting them! [There, that was sort of a 'why' answer - why it might be useful to have eyes on the side of your head. But we really just know 'how' things are, and then we guess about 'why' things evolved that way.]



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