Is evolution weird like that?

I'll explain on the update
Update: so i read that birds are dinosaurs kind of & the pterasaurs ( including pterodactles) were reptiles. i find that kinda odd cuz dinosaurs were always thought to be lizarrds cuz of theor scales and many walking on 4 legs, and i always thoughrs were descendants of pterodacles because they fly. Now its reversed.... show more so i read that birds are dinosaurs kind of & the pterasaurs ( including pterodactles) were reptiles. i find that kinda odd cuz dinosaurs were always thought to be lizarrds cuz of theor scales and many walking on 4 legs, and i always thoughrs were descendants of pterodacles because they fly. Now its reversed. The dinosaurs are the ones that are flying now. And the reptiles are walking on four legs. and to add to bonus, a bat is neither of them. its a mammal.
Update 2: im not talking human evolution
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