...An ecological survey of reptiles in parts of northwestern Texas... 
Henry S. Fitch 「Occurrence of the Garter Snake, Thamnophis sirtalis, in the Great Plains and Rocky Mountains」
...We have not found tadpoles of two species of Smilisca in the same bodyof water and therefore cannot offer observations on ecological relationships insympatric situations...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...An ecological analysis of the interbreeding of Crested Titmice in Texas...
Emil K. Urban 「Birds from Coahuila, Mexico」
...Because its unique geographical location and ecological setting supports a rich and varied avifauna, the Yucatán Peninsula has received considerable attention by ornithologists...
Erwin E. Klaas 「Summer Birds From the Yucatan Peninsula」
...An ecological study of the collared lizard (Crotaphytus collaris)...
Harrison B Tordoff 「Check-list of the Birds of Kansas」
...Inthese instances well marked ecological differences exist between thesubspecies involved...
James S. Findley 「Speciation of the Wandering Shrew」
...Ordinarily one tends to keep within a relatively smallarea that is familiar to it and that satisfies all its ecological requirements...
Henry S. Fitch 「Ecology of the Opossum on a Natural Area in Northeastern Kansas」
...Possibly this is because the habitat, or eventhe ecological niche, occupied in geological time by these micewas restricted, geographically and in kind...
Robert L. Packard 「Speciation and Evolution of the Pygmy Mice, Genus Baiomys」
...—In this habitat the third dimension (height) of the rainforest probably is the most complex insofar as the inter-relationships of species and ecological niches are concerned...
William E. Duellman 「Amphibians and Reptiles of the Rainforests of Southern El Peten, Guatemala」
...The limited ecological data suggest that thespecies inhabits the transition zone between the tropical scrub forestand the temperate hardwood forest...
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」
...Therefore, it seems as though the presence of the stream-habitatfor the tadpoles is a significant factor in the ecological distributionof the species of Ptychohyla...
William E. Duellman 「A Review of the Middle American Tree Frogs of the Genus Ptychohyla」
...Similar ecological relationships were observed for several species ofCosta Rican hylids...
William E. Duellman 「A Review of the Middle American Tree Frogs of the Genus Ptychohyla」
...Bragg (1943: 76) emphasized that in Oklahoma itis widely distributed over the state, occupying a variety of habitats,with little ecological restriction...
Henry S. Fitch 「Field Study of Kansas Ant-Eating Frog」
...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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