2006-09-22 11:14:07 · 11 answers · asked by ? 1 in Pets ➔ Birds
AS the sun gets lower in the sky and the days get shorter, mother nature tells then to fly south. Or perhaps they just decide that there is nothing left to eat and decide to go where there is food. Perhaps its a combination of lots of things like temperature change amount of daylight and lack of food.
They also might want to breed again so the go to where its warmer and there is plenty of food for their chicks.
2006-09-25 00:46:33 · answer #1 · answered by stevehart53 6 · 0⤊ 0⤋
It is governed entirely by the temperature, basically when it get's cold here there arent enough insects for the birds to eat. amazing to think that some of those young swallows are about to fly to Africa at perhaps only 7 weeks old.
2006-09-22 11:23:28 · answer #2 · answered by questor 3 · 0⤊ 0⤋
They sense the cold or something like that the same way birds can sense when there is a hurricane in africe.
2006-09-22 11:17:40 · answer #3 · answered by Eca 1 · 0⤊ 0⤋
What do you mean? A European or African swallow?
My favourite colour is blue.
2006-09-23 06:22:19 · answer #4 · answered by sarcasticquotemarks 5 · 0⤊ 0⤋
When the person who own's the mouth starts eating too much!
2006-09-22 11:35:55 · answer #5 · answered by Anonymous · 0⤊ 0⤋
the days get shorter and the weather gets colder.
2006-09-23 00:32:37 · answer #6 · answered by fenlandfowl 5 · 0⤊ 0⤋
when they see the rest of us stupid english heading for the airport
2006-09-26 06:22:52 · answer #7 · answered by Anonymous · 0⤊ 0⤋
They left early this year. Probably spotted all the immigrants coming in. I wish I could fly this dump :::::::::::::::::::::::::::
2006-09-22 14:31:12 · answer #8 · answered by redjonjak 2 · 0⤊ 0⤋
hours of daylight
2006-09-23 11:08:21 · answer #9 · answered by teenylollypopuk 3 · 0⤊ 0⤋
When they need to
2006-09-22 12:14:06 · answer #10 · answered by blissman 5 · 0⤊ 0⤋