I had a pair of canaries together, but they did not appear to do anything. He did not court her and she paid no attention to the nest. So I changed males, and she began to make her nest right away. Soon she laid 4 eggs. Only the first one hatched, and the others appeared infertile.
My question is, did she mate with the first one, and that's why the first one was fertile, and not mate with the second one? After mating, how long does it take for the fertilized egg to develop and come out?