...Geographically cottonmouths differ somewhat in their ecological requirements, but are basically much alike in most respects... 
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...An ecological study of the collared lizard (Crotaphytus collaris)...
Harrison B Tordoff 「Check-list of the Birds of Kansas」
...Grinnell (1933:54) characterizes the ecological nicheof the race pallidus as being "open, sandy ground, often ...
Terry A. Vaughan 「Mammals of the San Gabriel Mountains of California」
...Morphological and ecological differentiation of Peromyscus merriamifrom southern Arizona...
J. Knox Jones, Jr. 「Noteworthy Mammals from Sinaloa, Mexico」
...Inthese instances well marked ecological differences exist between thesubspecies involved...
James S. Findley 「Speciation of the Wandering Shrew」
...The ecological requirements of jumping mice, genus Zapus, andthe subspecies of Sorex vagrans that dwell in hydroseres are essentiallysimilar...
James S. Findley 「Speciation of the Wandering Shrew」
...) not only made a careful study of skins and skulls,but also employed many ecological data...
John A. White 「The Baculum in the Chipmunks of Western North America」
...Obviously, the diversity of ecological niches in the rainforest is sufficient to support a variety of related species...
William E. Duellman 「Amphibians and Reptiles of the Rainforests of Southern El Peten, Guatemala」
...In analyzing the ecological distribution within the forest, it is convenient to recognize five subdivisions (habitats); each is treated below as a unit...
William E. Duellman 「Amphibians and Reptiles of the Rainforests of Southern El Peten, Guatemala」
...The most striking ecological assemblage ofamphibians in the rainforest is the arboreal group of species...
William E. Duellman 「A Distributional Study of the Amphibians of the Isthmus of Tehuantepec, Mexico」
...On theother hand, the savannas and scrub forests are characterized by extremeconditions of desiccation, a factor of considerable importance inlimiting the ecological distribution of amphibians...
William E. Duellman 「A Distributional Study of the Amphibians of the Isthmus of Tehuantepec, Mexico」
...Sufficient ecological data to determine differences inhabitat between the two species have not been compiled...
William E. Duellman 「The Amphibians and Reptiles of Michoacán, México」
...Specimens of this lizard have been collectedinfrequently; the few locality records and limited ecological dataindicate that it inhabits dense scrub forest and tropical semi-deciduousforest...
William E. Duellman 「The Amphibians and Reptiles of Michoacán, México」
...The mean body temperature for active individuals ()is probably somewhat below the ecological optimum, because afew temperatures were abnormally low...
John M. Legler 「Natural History of the Ornate Box Turtle, Terrapene ornata ornata Agassiz」
...An ecological study of the narrow-mouthed toad (Microhyla) in northeastern Kansas...
Henry S. Fitch 「Field Study of Kansas Ant-Eating Frog」
...After geographical separation took place the initial genetic divergence between the two populations was maintained by means of ecological and ethological isolating mechanisms...
Juan R. León 「The Systematics of the Frogs of the Hyla Rubra Group in Middle America」
...At present, there is a paucity of ecological niches in theupland tributaries and large rivers, as compared with streams ofintermediate size...
Artie L. Metcalf 「Fishes of Chautauqua, Cowley and Elk Counties, Kansas」
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