Swallows and Early Summer

  ulrich 21:20 20 Apr 07

If the Swallows are in Africa, how do they know it's Summer in England, do the Robins or Blackbirds phone them up?

  hzhzhzhz 21:26 20 Apr 07

Tis the length of the days and the temperature in Africa that does it.

  hzhzhzhz 21:27 20 Apr 07

plus the phone calls of course.

  De Marcus™ 21:59 20 Apr 07

Joking aside, the Swans on our local park 'lake' didn't bother migrating this year.

If there was ever a weather forecast.......

  Forum Editor 23:40 20 Apr 07

is conventionally believed to be the migration trigger, but there is increasing evidence that temperature changes have something to do with it as well.

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