It's official. Nonexistent global warming affects everything, even great tits.
Rising temperatures are making our best-loved birds lay their eggs earlier, say conservationists.
This change could eventually threaten the survival of many garden species such as robins, chaffinches, swallows, blue tits and great tits.
They are laying earlier, with some nests filling up with eggs almost ten days sooner than in the 1960s.
It is thought the phenomenon is being driven by climate change, with the caterpillars needed to feed their chicks disappearing earlier in the year.
So far, our garden birds have kept pace with the changes to the caterpillars' lifecycles, but in time they could be left behind.
'The caterpillar lifecycle has the potential to shift even further and they could get out of synch which would be very bad news,' said Dr David Leech, of the British Trust for Ornithology.
Climate change is also taking its toll on many species of ducks, geese and wading birds which migrate to the UK each winter from their northern and eastern nesting grounds.
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