Comparative analysis of the vocalizations of hylorchilus wrens

Article Abstract:

Vocalization studies of Hylorchilus wrens show that the genus consists of two species, Nava's wren (H. navai) and Sumichrast's wren (H. sumichrasti), and suggest that it is related to the Canyon wren (Catherpes mexicanus). A new analysis of vocalization variations supports direct inheritance from a common ancestor for H. navai and H. sumichrastia but concludes that there is no substantial evidence to show that the Canyon wren is the closest relative of Hylorchilus wrens.

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A sexually dimorphic learned birdsong in the northern cardinal

Article Abstract:

Both male and female northern cardinals, Cardinalis cardinalis, sing and the sounds are very similar when heard from unaided ears. The dimorphism of the bird song of this cardinal species is examined based on acoustic structures. Results reveal that the songs of male and female northern cardinals are dimorphic based on syllable stereotypy and harmonic amplitudes. These differences are consistent and significant.

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Characteristics, use and possible functions of the perch songs and chatter calls of male Common Yellowthroats

Article Abstract:

A study of the sound patterns of male Common Yellowthroats reveals their usage of perch songs to attract males of the species and collectively oppose predators and chatter calls to counter conspecific, territorial aggressors. However, no instances of temporal or frequency feature changes for displaying motivational information were displayed by these birds.

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