Does diurnal variation in body mass affect take-off ability in wintering willow tits?

Article Abstract:

The risk of predation as a result of reduced take-off ability does not increase with the relatively small fat loads accumulated during the day by willow tits. This dispels the theory that birds with greater fat loads face a higher risk of predation. In an examination of the take-off ability of wintering willow tits relative to their fat load, no quantifiable effect of body mass on take-off ability was found, despite the tits being 7.7% on average heavier at dusk than at dawn.

Physiological aspects, Body weight, Birds, Bird flight, Animal flight, Titmice, Paridae

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Escalated fighting behaviour incurs increased predation risk

Article Abstract:

A study of male fighting behavior in South American cichlid fish and the willow warbler shows that escalated fighting behavior increases the danger of being preyed upon. Predation diminishes the vigilance in escalated fights and also influences the decisions made by the contestant during a fight. Fights are structured such that aggressive behavior is less in the beginning and increases along with the making of risky decisions toward the end.

Observations, Predation (Biology), Aggressive behavior in animals, Animal aggression

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Escalated fighting despite predictors of conflict outcome: Solving the paradox in a South American cichlid fish

Article Abstract:

Interactions between male cichlids were studied in terms of predictors of conflict outcome.

Behavior, Fishes, Cichlidae, Cichlids

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