THE survey of the black-headed gull (Larus ribibundus) carried out by P. D. Hollom, with the help of 160 other observers for the British Trust for Ornithology (British Birds, Jan. 1939), gives a ...
Medium-size, 3-cycle gull with sloping head, medium-size bill. On adult, note yellow legs, pale eyes, and neat “ring bill.” Breeding adult: pale gray upperparts; black wing tip with white ...
Numbers in Northeast and Atlantic Canada now declining; linked to egging and competition with expanding great black-backed gull populations.
Hosted on MSN1mon
Inland reserve hailed as 'vital' refuge for gullscommon gull and black-headed gull. During the colder months, small numbers of Mediterranean gulls, scarcely seen in Hertfordshire, also fly in, the trust said. "A majority of these species are ...
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