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Animalia >Chordata >Aves >Pelecaniformes >Phalacrocoracidae >Phalacrocorax >
orAnimalia >Chordata >Aves >Suliformes >Phalacrocoracidae >Phalacrocorax >

Video image showing conspecific aggression at a colony of great cormorants at Unoyama, Mihama-cho, Aichi prefecture on 8 February 2008. When a perpetrator intrudes a nest, a parent of the nest is returning and they fight for the nest. This is provably first image of infanticidal agression in the geat cormorant. The image format is "MPEG-4" and the file was compressed using the "H.264" codec.
Short version is available at http//www.momo-p.com/showdetail-e.php?movieid=momo090421pc02a.

Bellow is abstract of the article about infanticidal attack in great cormorants using this video image.

Nest intrusion and infanticidal attack on nestlings in great cormorants Phalacrocorax carbo: why do adults attack conspecific chicks?

Yukiko Inoue, Ken Yoda, Hidenori Fujii, Hirofumi Kuroki, Yasuaki Niizuma Journal of Ethology (in press) doi:10.1007/s10164-009-0192-6

Infanticide, the killing of young animals by conspecifics, has been observed in diverse taxa. The function of infanticide has been classified as exploitation, sexual selection, parental manipulation or resource competition. We observed infanticidal behavior and its reproductive results at five breeding colonies of great cormorants from January to August 2008. Eighteen cases of nest intrusions and/or attacks toward a chick by conspecific non-nest-owners were observed, and two of them were filmed. In both attacks, perpetrators pecked the necks of chicks several times with display. The chicks bent their necks down onto the nest and remained stationary. Our data did not support the exploitation hypothesis because adult cormorants did not use chicks as food. In addition, the perpetrators were not true parents and did not mate with the female nest owner, indicating that parental manipulation and sexual selection hypotheses were unlikely explanations. On the other hand, concurrent presence of adults during prelaying and chick-rearing periods at a particular colony affected the occurrence of nest takeovers and intrusions and/or attacks, suggesting that some conflicts over nests arise between individuals that are at different stages of the breeding cycle.

(Data No.momo091117pc01b)

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