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Researchers found that great tits are laying eggs earlier in the spring than they used to, keeping step with the earlier emergence of caterpillars.
Their movement to an earlier breeding time does not involve an evolutionary change, the scientists believe - it is simply that individual birds are able to change their behaviour, in the same way that they have presumably adapted to warmer or cooler phases before the era of human-induced global warming.
Originally posted by Britguy
But, their breeding cycles may change from one year to the next, dependent upon the availability of food sources, not just temperature.
What we want to do is to try and understand why some species are flexible and others aren't - it's the ones that aren't flexible that are going to be at risk.