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Birds--General/Two birds from one egg???

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Question
I found a nest of song sparrows. Followed the egg laying through leaving nest with pictures 2/day. Five eggs and six birds. Any comments??

Answer
Two birds can't come from one egg; the egg shell would be too small and the chicks would squash each other. The egg shell could have been chucked out the nest!

edit:
what do you mean by your comment 'Data does not agree with answer given. Sounds like a pat answer but does not consider the facts. Thanks'
If you already knew the answer to this question, then why did you ask? If two chicks develop in one egg, generally only one chick will survive, or neither of them; there is a very VERY tiny chance (I mean like one in a thousand) that the two birds will survive.

What is a 'pat answer'? and why am I not 'considering the facts'? I tell you what I know and I am here, giving up my free time and volunteering to help YOU. Don't give me snotty comments if I've done my best to help you!

Next time, use google for your 'data' instead of asking me.

Birds--General

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Abi

Expertise

I CAN'T ANSWER QUESTIONS ON ANIMALS OTHER THAN CHICKENS/DUCKS/GEESE- I WILL TRY BUT THEY ARE NOT MY SPECIALIST SUBJECT- PLEASE DO NOT ASK ME QUESTIONS ABOUT BUDGIES, FINCHES, PARROTS, COCKATIELS OR OTHER 'EXOTIC' BIRDS. I can answer questions on pretty much all CHICKEN breeds, including fancy and bantam birds. I can give advice on how to get the best egg production, brightest yolk colours and darkest egg shell colours, breeding (using broody hens, not incubators), bird problems/illnesses. I can give advice on all aspects of basic chicken care but I breed chickens for my own pleasure only, I do not often show or sell my birds.

Experience

I own and breed a wide range of chickens, but I speciallise in cochins and crevecour bantams; crevecours have a large crest (an afro!) so I can answer questions on problems concerning them; cochins have feathered legs, which leads to no end of problems which I have experienced! I also own a large flock of domestic, rescued 'battery' hens, and a single maran hen, Hilda, who is the matriarch of her flock, so I can give advice on how to get the best colour of maran eggs!

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