What are some examples of biotic and abiotic factors of an Eastern Bluebird?

Question

Biotic is living factors and abiotic is non-living factors.
So, for a bluebird, sunlight (length of days effecting ovulation)availbility of water for drinking would be Abiotic factors.

Food, nesting materials (like dry grass)would be examples of Biotic factors. Can you think of others?
A couple sites below may help:

http://en.wikipedia.org/wiki/Western_Bluebird
http://en.wikipedia.org/wiki/Eastern_Bluebird