Relatedness threshold for nepotism in Japanese macaques

Article Abstract:

The relationship between nepotism and the degree of relatedness in female Japanese macaques was investigated by analyzing one category of the beneficient behavior, namely, agonistic support in conflicts. Dominance relationships of adult females with their female kin were determined based on the direction of submissive behavior. Results indicated that the relatedness threshold for nepotistic aiding exist in mothers, sisters and grandmothers, but not in the aunt-niece level of relatedness.

Animal behavior, Japanese macaque

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Absence of social recognition in laboratory-reared cuttlefish, Sepia officinalis L

Article Abstract:

Laboratory-reared cuttlefish, Sepia officinalis L., do not seem to recognize their conspecifics. Test results show that the subjects cannot discriminate between familiar and unfamiliar individuals. This indicates that recognition of social partners is not linked with social interactions among cuttlefish. Their interactions rely instead on size, internal motivation and the behavior patterns of other individuals.

Cephalopoda, Cephalopods

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Social calls coordinate foraging in greater spear-nosed bats

Article Abstract:

The social calls emitted by the greater spear-nosed bats, Phyllostomus hastatus are contact calls that coordinate foraging activities in this species. This is the conclusion drawn from seasonal observations and playback investigations undertaken in colonies in Trinidad, West Indies. The evidences that proved these screeches to be social calls in the greater spear-nosed bats are presented.

Telecommunications systems, Bats, Bats (Animals)

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