Use of foraging trails by Norway rats

Article Abstract:

The residual trails formed by Norway rats, when returning after eating, act as cues for other rats. The attractiveness of a trail is positively related to the frequency of visits on the path and is unrelated to the amount of food eaten by a rat before depositing the trail. The trails are composed of either food particles, a kind of scent from the sebaceous glands or urine. The trails are similar to the chemical trails made by ants returning to their nests from a feeding spot.

Behavior, Trails, Rattus norvegicus, Norway rat

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Inter-sexual signalling and the functions of female coloration in the tropidurid lizard Microlophus occipitalis

Article Abstract:

The function of bright female colorations in Micropolus occipitalis was analyzed to characterize inter-sexual signalling or sexual communication in tropidurid lizards. The intensity of the bright red throat colorations in female Micropolus occipitalis was dependent on the reproductive state and mating behavior of the lizard. Furthermore, red throat coloration was important in communicating information to males about the reproductive maturity of the female.

Psychological aspects, Sexual behavior in animals, Animal sexual behavior, Display behavior in animals, Animal display behavior, Color of animals, Animal coloration

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Functional referents and acoustic similarity: field playback experiments with rhesus monkeys

Article Abstract:

Habituation experiments were conducted to determine the mechanism by which rhesus monkeys, Macaca mulatta, classify acoustic variation in the five acoustically distinctive calls when individuals find food. The two variables tested are the acoustic feature and the functional referent of the calls. Results reveal that during classification of food-associated calls in rhesus monkeys, referential differences are more significant than acoustic differences.

Telecommunications systems, Rhesus monkey, Cognition in animals, Animal cognition

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