By far the most common narratives about aliens is common that the respective species or races with much at least humanoid also trains claims or conceived.
There are no rational reason.
Why should aliens resemble us?
Well, one could postulate that only those varieties wanted to come here aliens who find there similar looking one, the rest have no interest in us.
That sounds to me also very naive. Why you should not care about intelligent or less intelligent people who quite differently constructed than yourself?
Where did all the ants and algae and fungal researchers here below?
It is, therefore, once again, very likely to act in a founded on self-love as to stupidity from hubris projection. (more ...)