Birdwatch: The first migrants are already making their epic treks
Although autumn is still some way, off migration for some birds is already in full swing.
Many swifts have already gone to spend the winter in southern Africa. The young birds leave first, almost immediately after fledging, and without any adults to guide them because the parents, after feeding chicks for up to seven weeks, need time to build up their own fat reserves before they leave.
There are usually two to three chicks in each nest which hatch two or three days apart. At about three weeks old they begin to move around the nest chamber and exercise by performing press-ups on their wing tips to strengthen them.
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