Tan and white color morphs of White-throated Sparrows differ in their non-song vocal responses to territorial intrusion

Article Abstract:

Research into the number and type of songs and call vocalizations used by tan-striped and white-striped male White-throated Sparrows in response to simulated territorial intrusion indicates that three vocalizations which seem to reflect ambivalence or lower levels of aggression regarding a territorial encounter are more common in tan-striped males than in white-striped males. These vocalizations are whisper (quiet) songs, trills and seeps. Evidence was found to support the hypothesis that tan-striped males produce more low aggression calls in response to simulated territorial intrusion.

Behavior, White-throated sparrow

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Differences in singing behavior between Rufous-collared Sparrows in Costa Rica and northwestern Argentina

Article Abstract:

The Rufous-collared Sparrows in Costa Rica popularly possess individual song repertoires and they do not have the terminal trill. Comparative study with the Argentinian population suggest that songs there are more similar than songs from Costa Rica. The studies from Argentina reveal that the Rufous-collared Sparrows generally have the repertoire of one song per bird.

Argentina, Costa Rica, Natural history, Sparrows

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Grit use by House Sparrows: effects of diet and grit size

Article Abstract:

A study of the process and dynamics of grit use by free-ranging House Sparrows revealed their usage of significant quantities of grits to be independent of seasonal variations. Gizzards of birds consuming small grits retained more particles than those of consumers of large grits, revealing the significant correlations between grit size and grit use in these sparrows.

Food and nutrition, English sparrow

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