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Avian range expansion describes how birds expand their habitat. Because of the activities of birdwatchers, these range expansions are well documented. Throughout the last century a number of birds have expanded their range. Birds that were once thought to be only located on the West Coast of have moved eastward all the way to the East Coast, an ...
An Analysis of Learning in Young Anatidae (1957) Peter Hubert Klopfer (born August 9, 1930) [1] is a German-born American zoologist, civil rights advocate and educator. He is Professor Emeritus of Biology at Duke University, where in 1966 he co-founded, with John Buettner-Janusch, the Duke Lemur Center (formerly Duke Primate Center). [2]
Habitat-selection hypothesis. Habitat selection hypothesis is one of several hypotheses that attempt to explain the mechanisms of brood parasite host selection in cuckoos. Cuckoos are not the only brood parasites, however the behavior is more rare in other groups of birds, including ducks, weavers, and cowbirds. [1]
Basic bird counts are a good way to estimate population size, detect changes in population size or species diversity, and determine the cause of the changes if environmental or habitat data is collected as well. Basic bird counts can be completed fairly easily and inexpensively, and they provide general information about the status of a bird ...
Description. The least flycatcher is hard to distinguish from the other birds of its genus. [5] The bird is one of the smallest of the genus Empidonax, measuring 12 to 14 cm [6][7] in height with a wingspan of 19 to 22 cm [8] and weighing approximately 10.3 g. [9] Its plumage is dull olive-gray on its back and whitish on its belly, notably ...
Brood parasitism. A shiny cowbird chick (left) being fed by a rufous-collared sparrow. Eastern phoebe nest with one brown-headed cowbird egg (at bottom left) Shiny cowbird parasiting masked water tyrant in Brazil. Brood parasitism is a subclass of parasitism and phenomenon and behavioural pattern of animals that rely on others to raise their young.
Resource selection function. Resource selection functions (RSFs) are a class of functions that are used in spatial ecology to assess which habitat characteristics are important to a specific population or species of animal, by assessing a probability of that animal using a certain resource proportional to the availability of that resource in ...
An isodar, or habitat isodar, is a theory in evolutionary ecology developed in the late 1980s by Douglas W. Morris. [2][3] Isodars model density-dependent habitat selection for one or two species in two habitats according to the ideal free and ideal despotic distributions. Isodar is a two-part word: "iso" meaning equal in Latin; "dar" for ...