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The pine siskin in its typical morph is a drab bird, whereas the Eurasian siskin (a bird the species does not naturally co-exist with), in many plumages, is much brighter. Adult male Eurasian siskins are bright green and yellow with a black cap, and an unstreaked throat and breast; the pine siskin does not have a corresponding bright plumage.
In December 2019, the International Union for Conservation of Nature (IUCN) listed 8460 least concern avian species. [1] Of all evaluated avian species, 76.9% are listed as least concern.
Pine siskins were among the species observed by volunteers at the most recent Christmas Bird Count conducted near Gatlinburg, Tennessee. They are most abundant and visible at lower elevations in ...
Pine siskin: Spinus pinus (Wilson, A, 1810) 191 Black-capped siskin: Spinus atriceps (Salvin, 1863) 192 Black-headed siskin: Spinus notatus (Du Bus de Gisignies, 1847) 193 Black-chinned siskin: Spinus barbatus (Molina, 1782) 194 Yellow-bellied siskin: Spinus xanthogastrus (Du Bus de Gisignies, 1855) 195 Olivaceous siskin: Spinus olivaceus ...
The genus Spinus was introduced in 1816 by the German naturalist Carl Ludwig Koch with the type species by tautonomy as Fringilla spinus Linnaeus, 1758, the Eurasian siskin. [1] [2] The genus name is from the Ancient Greek σπίνος spínos, a name for a now-unidentifiable bird.
Type III or concave curves have the greatest mortality (lowest age-specific survival) early in life, with relatively low rates of death (high probability of survival) for those surviving this bottleneck. This type of curve is characteristic of species that produce a large number of offspring (known as r-selected species).
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Pine grosbeak, Pinicola enucleator (U) Gray-crowned rosy-finch, Leucosticte tephrocotis (U) Black rosy-finch, Leucosticte atrata; House finch, Haemorhous mexicanus; Cassin's finch, Haemorhous cassinii; Redpoll, Acanthis flammea (NC) Red crossbill, Loxia curvirostra; White-winged crossbill, Loxia leucoptera (R) Pine siskin, Spinus pinus