| نقل قول | Eising, C. and T. Groothuis, 2003 Yolk androgens and begging behaviour in black-headed gull chicks: an experimental field study. Anim. Behav., 66:1027-1034. |
| مرجع | 8528 Eising, C. and T. Groothuis, 2003 |
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| Named Used as Valid | Larus ridibundus |
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