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cent of the eggs will hatch. The female usually continues brooding the young for about 10 days because they have not developed feathers at this point. This is necessary to keep the young warm during cold spells.
If you have young martins at your site that are just beginning to chirp, they are about a week old. Their eyes begin to open at the 9-10 day old stage.
Both martin parents feed the young small insects during the first couple of weeks. They often take turns guarding the nest while the other one searches for food.
Fledging normally occurs on or about the 28th day, but could be as
late as 32 days. Usually
the oldest bird leaves
93.1%