The size of the breeding population was not changed, but there were fewer non-breeding blue tits in the population.
22.
Researchers cross-fostered eggs between nests of blue tits and great tits and observed the resulting behavior through audio-visual recording.
23.
The song is a " tsi-tsi-tshurr-tsi-tsi-tshurr ", which has been described as intermediate between blue tit and crested tit.
24.
The "'blue tit "'is a species of lycaenid or blue butterfly found in parts of South Asia and Southeast Asia.
25.
Blue tits from one population have little interest in the other population at breeding time, helping to keep them separate.
26.
:I suspect the blue tit is the commonest in SE England, but populations can fluctuate wildly from year to year.
27.
It has a variety of birds, including great spotted woodpeckers, blue tits, great tits, robins, wrens, long tailed tits and jays.
28.
All adult Eurasian blue tits share the same coloration to a high degree of fidelity, unmistakably identifying the " morphospecies ".
29.
The vegetation is chalk scrub, and there are many species of birds, including yellowhammer, spotted flycatcher, blue tit and tawny owl.
30.
Woodland birds include jay, green woodpecker, great spotted woodpecker, carrion crow, blue tit, great tit, common chaffinch, nightingale, kestrel and bullfinch.
