I am still enchanted by nature and Winged Migration is an enchanting movie about nature, despite the fact that it is not up to the "standards" of some "birders".QUOTE]
No no no no no, that's just what Winged Migration and March of the Penguins are not! They are distortions of nature filtered through the anthropomorphising of non-birding film-making story-tellers (about as related to nature as The Three Billy-goats Gruff).
If you want to watch them as entertainment films that's up to you, though I still think Winged Migration even on its own terms could have been executed better. But you are not, absolutely not, watching films about nature: and if someone like you can be conned by them to that extent then ordinary punters have no hope and are bound to get wrong messages.
John