Remember these chics?

We incubated 27 eggs.  5 chics hatched, two small chics didn't make it. One chic started coming out of the shell and didn't make it.

They aren't exhausted anymore!

I don't know how to sex chics. Which means that I don't know if we have hens or roosters.  How do I know?

We were hoping that the chickens would nest.  But I think we have a batch of dumb chickens. When I read online,  it stated that eggs which aren't incubated right away should be stored at 50 degrees. Many of these eggs got colder than that.  Warmer and colder, that couldn't have been good for them.