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Gull-Billed Tern Gelochelidon nilotica

Several observations were made at Lake Vransko (UTM WJ46) between 1 – 8 May 2005. Agricultural areas at the northern part of the lake adjoin wet meadows and reedbeds. The lower sections of agricultural fields were inundated. Almost each day, we could observe 3 – 6 individuals of Squacco Heron Ardeola ralloides, 2 – 20 Little Egrets Egretta garzetta, 2 – 8 Glossy Ibises Plegadis falcinellus, 2 – 4 Wigeons Anas penelope, 2 – 16 Mallards Anas platyrhynchos, 4 – 6 Garganeys Anas querquedula, 2 – 50 Coots Fulica atra, 1 – 4 Black – winged Stilts Himantopus himantopus, 1 – 3 Lapwings Vanellus vanellus, 3 – 7 Curlew Sandpipers Calidris ferruginea, 1 – 2 Black– tailed Godwits Limosa limosa, 1 – 2 Curlews Numenius arquata, 1 – 3 Spotted Redshanks Tringa erythropus, 1 – 2 Redshanks Tringa totanus, 1 – 5 Greenshanks Tringa nebularia, 1 – 3 Wood Sandpipers Tringa glareola, and 4 – 10 Common Sandpipers Actitys hypoleucos. Usually there were 4 – 12 Black– headed Gulls Larus ridibundus and 4 – 5 Yellow– legged Gulls Larus cachinnans resting in ploughed up areas. Some (1 – 5) Ringed Plovers Charadrius hiaticula often ran past them. On 2 May, four Whiskered Terns Chlidonias hybridus and one Black Tern Chlidonias niger were noticed in the same place. On 3 May, a Gull– billed Tern was seen sitting in the company of Black– headed Gulls and Yellow– legged Gulls. It took wing several times, but soon returned to the ploughland. However, it was no longer seen during the ensuing days. We have found three records on Gull– billed Tern sightings at Lake Vransko: on 10 July 1972 [Kralj, J. (1997): Ornitofauna Hrvatske tijekom posljednjih dvjesto godina. – Larus 46: 1– 112], on 27 April 1995, 3 individuals [Radović, D., Tutiš, V. & Kralj, J. (2004): Inventarizacija i valorizacija ornitofaune Parka prirode Vransko Jezero. – Zavod za Ornitologiju HAZU, Zagreb] and 6 May 1995, 1 specimen [Stipčević, M. (1996): A contribution to the Croatian list of rare and scarce birds recorded from 1985 – 1995. – Natura Croatica 5 (1): 53– 81].

Gull-Billed Tern; Gelochelidon nilotica; Lake Vransko; Croatia

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