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One color-banded black-capped chickadee flock was studied intensively at a winter feeder in Wisconsin. Flock structure was examined by measuring association among flock members in three ways: spatial proximity, temporal association, and association of individuals during flock movements....
Social behavior and demography of a freeliving population of individually marked Belding's ground squirrels (Spermophilus beldingi) were studied from 1974 through 1980 at Tioga Pass, California. Relative frequencies of fighting, chasing, cooperation in chasing conspecifics, and assisting...
A study of social organization in an herbivorous lizard Ctenosaura hemilopha investigated the role of dominance in group member behavior. Attention focused on a very populous (16 ind.) colony to examine causes and effects of crowding with respect to competitive factors. Lizards were colonial,...
Cnemidophorous uniparens, an all-female, parthenogenetic species of whiptail lizard (Teiidae), were housed in the laboratory under seminatural conditions in groups of four, in pairs, or as isolates. Group structure and an animal's position in the dominance hierarchy affect reproductive effort....
A number of predators, including a bat (Trachops cirrhosus), a frog (Leptodactylus pentadactylus), an opossum (Philander opossum), and a crab (Potamocarcinus richmondi), prey on the neotropical frog Physalaemus pustulosus, which calls in choruses on Barro Colorado Island, Panama.
In rhesus monkey populations, animals related by descent to some female comprise a matriline or genealogy. Data on blood protein polymorphisms in the Cayo Santiago rhesus colony indicate that allele frequency variations among matrilines in social groups are large. These variations occur despite...
Dominant and subordinate male house mice (Mus musculus) were examined for differences in ability to induce a pregnancy block (Bruce effect) in recently inseminated female conspecifics.
A male became behaviorally dominant or subordinate by one or two daily 15-min agonistic encounters...
The hypothesis that the posterolateral scent glands of male microtine rodents (Muridae) direct the attacks of other males was tested.
Montane voles (Microtus montanus nanus, Rodentia: Muridae) were studied in unconfined populations and in an exclosure in open fields in Wyoming, USA. Field work involved capture-mark-recapture grids, tagging select individuals with irradiated wires, subcutaneous implantation of dye pellets, and...
The breeding season of H. ustulata extends over a 2 1/2 month period in the Sonoran desert near Phoenix, AZ. Individual males are active on mountain ridges for periods averaging about 3 weeks for those wasps captured in the first half of the flight season. Many males live more than 1...
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