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Song matching in western meadowlarks
TLDR
Song playback to western meadowlarks (Sturnella neglecta) at Delta, Manitoba, showed that the tendency of males to respond with the same song type (match) depended on the source of the recording, indicating that matching and nonmatching are qualitatively different responses.
FLUCTUATIONS OF DEER MICE IN ONTARIO IN RELATION TO SEED CROPS
TLDR
Declines in breeding and apparent survival were responsible for ending population peaks in deer mice populations in Algonquin Park, Ontario, Canada, and are interpreted principally as responses to variation in food supply.
Design of Playback Experiments: The Thornbridge Hall NATO ARW Consensus
Playback is an experimental technique commonly used to investigate the significance of signals in animal communication systems. It involves replaying recordings of naturally occurring or synthesised
Differences in parental contribution among pair types in the polymorphic White-throated Sparrow
TLDR
It is found that pairs consisting of TS males and WS females showed biparental care in which the partners made approximately equal investment in feeding nestlings, and explanations for differences in contribution to nestlings between the sexes and between morphs are suggested.
Howling as a Means of Communication in Timber Wolves
TLDR
This study suggests that howling identifies the species, functions in the location of specific animals, provides specific information about the howling animal, and is, therefore, of great value in coordinating the social activities of wolves.
White-throated sparrow morphs that differ in song production rate also differ in the anatomy of some song-related brain areas.
TLDR
The present study measures the volumes of several nuclei in the avian song system and relates these to color morph and to sex, finding that robustus archistristalis and the tracheosyringeal part of the hypoglossal nucleus, nuclei closely involved in song production, are larger in white- Striped than in tan-striped birds.
Thermal biology of the common garter snake Thamnophis sirtalis (L.)
TLDR
The thermoregulatory significance of a striped-melanic colour polymorphism in the common garter snake was assessed through a combination of labortory experimentation and field study and some evidence and argument is presented to suggest that melanism also may confer protection against overheating in warm periods.
Bias and mortality in the use of tartar emetic to determine the diet of ovenbirds (Aves: Parulidae).
TLDR
Most birds exposed to emetic regurgitated, although to a variable degree, and the action of the chemical was independent of prey type, however, differential digestibility of prey types was found to be a serious problem, making the application of correction factors in the estimation of the diet necessary.
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