Results 141 to 150 of about 4,694,163 (199)

Biometrics and colour forms of chicks of common terns and arctic terns

Ringing & Migration, 1984
Methods of distinguishing the chicks of Common and Arctic Terns based on measurement of tarsus length and on the colours of the dorsal down and the belly down are described. The variation of tarsus length with age was investigated by relating it to bill length, to mid‐toe length, and to body weight.
J. C. A. Craik, S. M. Harvey
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Evidence for social facilitation of preening in the common tern

Animal Behaviour, 1998
Social facilitation of reproductive behaviour has been studied extensively in gulls and terns, but social facilitation of preening has been reported only anecdotally, and has not been previously quantified. We studied a common tern, Sterna hirundo, colony during the summers of 1996 and 1997 to test for socially facilitated preening.
, Palestis, , Burger
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Primary moult in black terns and common terns

Ringing & Migration, 1987
In July‐September 1984 the primary moult of Black Terns Chlidonias niger and Common Terns Sterna hirundo was studied in the southwestern region of the Ijsselmeer near Amsterdam, The Netherlands. The study was undertaken using the method of collecting and identifying shed primaries. Primaries collected were identified by their lengths. Both species have
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ON HOMOTYPOSIS AND ALLIED CHARACTERS IN EGGS OF THE COMMON TERN

Biometrika, 1914
(1) Origin of the material and method of measturement. The settlement of Common Terns, which provided material for the present work, is one of old establishment on Blakeney Point, Norfolk. This is a shingle spit of some 8 miles in length on the north coast of Norfolk, about 12 miles west of Cromer.
William Rowan, K. M. Parker, Julia Bell
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Group Adherence in the Common Tern

Bird-Banding, 1951
An additional decade of field work and study in this area has yielded data which not only further substantiate the concept of the Cape 'Cod group of terns, but also show some of the reasons for the persistence of this phenomenon. It suggests that while kinship is an important causative factor, as in similar associations of other forms, it is ...
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Chick Survival in Terns (Sterna Spp.) with Particular Reference to the Common Tern

The Journal of Animal Ecology, 1972
The differential survival of young birds within a brood prior to fledging occurs in many bird species. This phenomenon is particularly common in raptors, storks and corvids where it has been well documented (e.g. Schmaus 1938; Schuiz 1942, 1957; Lockie 1955), but it also occurs in various other species.
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A Case of Cooperative Polyandry in the Common Tern

Waterbirds, 2004
Abstract The first case of cooperative polyandry in the Common Tern (Sterna hirundo) is reported. During the breeding season of 2000 two males, originating from the same brood, bred together with a female, who was paired in the previous season with one of the males. Both males copulated with the female.
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Factors in the Incubation Behavior of the Common Tern

The Auk, 1943
Hartert (Nov. Zool., 32: 147, 1925) says: "This peculiar bird is known only from the type specimen. It is very peculiar, the crown to the base of the upper bill nearly black, underside heavily striped. I am not sure about its relationship." Hartert and Steinbacher (V6gel pal. Fauna, Erganzungsband, 4: 374, 1935) says: ". . .
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DDE and reproductive success in some Alberta common terns

Canadian Journal of Zoology, 1973
A study of the relationship of DDE to reproductive success of an inland breeding population of common terns. Sterna hirundo, had been carried out in 1969 and 1970 at Chip Lake, Alberta. Although a continuing decrease of DDE residues in eggs bad occurred, eggshell thickness remained unchanged.
B, Switzer, V, Lewin, F H, Wolfe
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Divorce and asynchronous arrival in common terns, Sterna hirundo

Animal Behaviour, 1999
We investigated which of three hypotheses (better option, incompatibility or asynchronous arrival) best explains divorce in the common tern. One partner did not return the next year in 18.5% of 150 pairs. Among the 106 pairs in which both mates returned, the divorce rate was 18.9%.
, GonzáLez-SolíS, , Becker, , Wendeln
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