Answer:
There are lots of transitional organisms in the fossil record though it does take very specific and precise conditions for a fossil to be preserved, a deer that dies in a field will not end up in the fossil record so we are looking at a small sampling of the evidence (and a good thing too or there wouldn't be anywhere to walk with all the bones laying around)
Explanation:
The main food sources of the birds( the plentiful recourses within the environment occupied by the species)
A mutation may result change in the way you look, you could lose sight, could be born with some genetic issues.
