I think for most birds, reproduction occurs by the males fertilizing the egg externally after the female has laid it. correct me if I'm wrong.
What did the parasitic Candiru fish say when it finally found a host? - - "Urethra!!"
u cannot externally fertilise an egg with a shell so it became necessary to evolve internal fertilisation which would allow the sperm to get into the egg before shell formation
Fertilization is definitely internal in birds via cloacal insemination and fertilization occurs even before the shell is processed around the egg...........thats what I studies way back about 5 yrs..........dont think things have changed much since then........
Wow...I thought I was the only one who used to believe birds fertilized eggs externally...My cockteil keeps laying them and they sit and sit, diligently...No little birds, ever...He won't touch her...He does hump his perch though...I wish he would get smart but this is like the 5th batch that I know he won't figure it out now...Any advice?
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