Morton Arboretum lived up to its hot spot reputation by contributing western kingbird, pileated woodpecker, summer tanager, blue grosbeak, yellow-throated warbler and red crossbill
I got my first Da Lat endemic, a chunky Da Lat Crossbill once lumped in with the Red Crossbill
but now considered by many a good species.
White pines are known to provide shelter and food for a number of birds, including the red crossbill
, and mature trees can grow up to 200 or 250 years old, providing stability to the forest system.
1957) reported the red crossbill
(Loxia curvirostra) in Mexico from northern Baja California, Sinaloa, Nayarit, Jalisco, Michoacan, Guerrero, Chiapas, Chihuahua, Durango, Queretaro, Mexico, Distrito Federal, Morelos, San Luis Potosi, Puebla, Tamaulipas, and Veracruz.
Seeds of pines are eaten by game birds such as turkey and quail; songbirds such as Red Crossbill
, Evening Grosbeak, Brown-headed Nuthatch, Pine Siskin, Car olina Chickadee, and Pine Warbler; and mammals such squirrels and mice (Martin, et al.
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).
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.
Here, we explore the consequences of seasonal fluctuations on the evolution of morphological traits related to foraging in the red crossbill
Virtually none ([is greater than or equal to]3%) of the variation in Red Crossbill
, Western Wood-Pewee, Olive-sided Flycatcher, Red-breasted Sapsucker, and Red-tailed Hawk abundance was explained by late-seral forest area.
At times, the red crossbill
, a bird that feeds only on conifer seeds, may depend solely on Table Mountain pine seeds.
Integration of environmental cues to time reproduction in an opportunistic breeder, the red crossbill
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.