http://healium.blogspot.com/2006/06/...her-stuff.html

http://www.newton.dep.anl.gov/natbltn/400-499/nb456.htm

I found these sites Pam. Interesting

Bird gestation periods and other stuff

My post about "What brings you here?" actually brought more people looking for bird gestation periods. Google is sending people by the dozens who are looking for "hummingbird gestation period," "cardinal gestation period," "house wren gestation period," and so on. To those who have come here for that information, let me offer these notes.

The black-chinned hummingbird gestation (incubation) period is about two weeks.
From what I've been able to find on the Internet, cardinal eggs hatch after 11 to 13 days, house wrens hatch after 13 or 14 days.
I've found it more productive to search for "incubation period" than "gestation period." Like I said below, I made the same mistake myself when I first wrote about the hummingbirds in my yard, so please don't think I'm criticizing! Just learning from my own mistakes.