so the birds should be on the floor? humming birds float, apparently many birds hover as well,
while im sure youd love to see some bird dashing around hitting you, but i doubt youd want to fight it.
http://www.youtube.com/watch?v=O-txnYnZDd4

any game requires a certain suspension of disbelief, if you dont want to fight em dont fight em, doesnt mean they shouldnt exist