The number of birds seen in London gardens this winter has fallen, the Royal Society for the Protection of Birds (RSPB) has said.
Erratic weather has confused wildlife, the RSPB says
There were nearly three times more sightings of starlings, the most common species, in 1979 compared to 2007.
The RSPB blamed the trend on "erratic weather" which has left wildlife "out of kilter with the seasons".
The top three species for London in the RSPB's 2007 Big Garden Birdwatch are starling, house sparrow and blue tit.
Providing easily available food and shelter in gardens may be all that is necessary to attract the birds back, the society said.
Tim Webb, of the RSPB, said: "The erratic weather we've experienced so far this year has confused our wildlife. Birds are laying early then struggling in the cold, our wildlife is out of kilter with the seasons."