crossbill

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Synonyms for crossbill

finch with a bill whose tips cross when closed

References in periodicals archive ?
As such, the red crossbill is added to the list of permanent avian residents for Nuevo Leon.
We used a boreal finch, the Red Crossbill (Loxia curvirostra), in experiments to test the effect of spines on foraging rates, because crossbills forage on seeds in both closed and open cones (Benkman 1987a, b, Benkman and Lindholm 1991).
Evolutionary differentiation in morphology, vocalizations, and allozymes among nomadic sibling species in the North American Red Crossbill (Loxia curvirostra) complex.
What scientists have regarded as a single species, the red crossbill, may in fact be eight separate species -- or even more, according to Benkman and Jeff Groth of the American Museum of Natural History in New York City, both of whom have investigated crossbill taxonomy.
Type 5 red crossbills forage on different species of conifers during different times of the year (Benkman 1993).
For example, it was shown that four types of red crossbills have bill and palatal structures that approximate the predicted optima for foraging on the conifers they most use during winter (Benkman 1993; unpubl.
Six male and four female red crossbills (type 5) were captured on 18 and 19 September 1993 in a lodgepole pine-Engelmann spruce forest near Aspen, Colorado.
We used bill depth as a measure of bill size because it (1) is not subject to wear; (2) has the largest weighting on the first principal component of four bill measurements (Benkman 1993; also see Groth 1993); (3) should be proportional to the maximum force a crossbill can exert when biting between the cone scales (Benkman 1987b; also see Wiens 1989); and (4) is closely related to the ability of four different types of red crossbills, including type 5, to extract seeds from conifer cones (Benkman 1993).
27) for 30 type 5 red crossbills (includes 10 birds from this study and 20 measured in other studies) and the distribution of bill depths was not significantly different from a normal distribution (using the Shapiro-Wilk's statistic).
Here, I describe natural patterns of changing reproductive physiology in free-living individuals of the smallest of the sibling species of North American Red Crossbills (see Groth 1993) as functions of season and conifer seed availability.
Recently, Groth (1988, 1993) has classified eight "types" of Red Crossbills in North America north of Mexico as sibling species, based on morphology, allozymes, and voice.
Habitat at my primary field sites is that preferred by type 3 Red Crossbills (Groth 1993; T.
Nonbreeding type 3 Red Crossbills were abundant in the Puget Sound basin in fall and winter 1987-1988.
The most plausible interpretation of these data is that type 3 Red Crossbills become reproductively refractory to reproductive stimuli during September.
Irruption or eruption, the phenomenon typically involves one or more of North America's "big eight" boreal seed-eaters: the common redpoll, pine siskin, purple finch, evening grosbeak, pine grosbeak, red crossbill, white-winged crossbill and red-breasted nuthatch.
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