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In natural streams, males are bigger than females in precopula pairs of the freshwater amphipod Gammarus pulex. A set of experiments is described, the results of which are consistent with the hypothesis that males are larger as a result of a mechanical constraint and not intrasexual competition...
The response of the starling to sugar solutions was investigated as this species, which eats sweet fruits, does not prefer sugar solutions according to the literature.
An energetic analysis of the foraging behaviour for nectar of Eristalis tenax L. is presented. The rate of energy gain while foraging on Aster is low (0.01 W) relative to similar calculations for bees, but the flies can fill their crop in about 75–220 min. Flies visit the nectar-bearing ring of...
In a laboratory song tutoring experiment, eight male White-crowned Sparrows learned their natal song dialect, presented to them at 10 to 50 days of age, in preference to an alien dialect, presented to them from 51 to 90 days of age; two males learned the alien dialect, one developed a hybrid...
In an attempt to evaluate the importance of mate guarding in the Pied Flycatcher several removal experiments were performed during the breeding season 1982. Males were captured 1–3 days before the onset of egglaying, since this is a period when the females are likely to be receptive to...
The responses of individually marked pikas (Ochotona princeps) to terrestrial predators were investigated in 1980 and 1981 in the Rocky Mountains of Colorado. Pikas uttered short call vocalizations in a variety of contexts: preceding or following an individual's movement, and in response to...
Foraging and echolocation behavior and its ontogeny in the lesser bulldog bat, Noctilio albiventris, were studied in Panama under field and captive conditions. The vocalizations utilized for echolocation and communication were monitored. Adult N. albiventris captured insect prey from the water...
Laboratory studies of nestmate recognition (250.0 h of behavioral observation) were conducted on two species of paper wasps (Polistes). Gynes of P. carolina isolated from their natal nest and nestmates at emergence later failed to recognize nestmates, but gynes previously exposed only to their...
This paper extends previously published observations of the sexual behavior of the redspotted newt. In encounters between single males and females, the male either performs a brief lateral, or ‘hula’, display or clasps the female and holds her in amplexus for as long as 3 h.
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