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Zoology

Eastern Illinois University

1974

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Full-Text Articles in Life Sciences

Defensive Behavior Of The Hognose Snake (Heterodon Platyrhinos), Brenda S. Hemken Jan 1974

Defensive Behavior Of The Hognose Snake (Heterodon Platyrhinos), Brenda S. Hemken

Masters Theses

Fourteen out of sixteen Heterodon platyrhinos eggs were hatched in late August, 1973. The immature snakes were manually stimulated and the resultant bluffing and death-feigning behaviors were observed. All of the experimental snakes bluffed, but only three out of ten feigned death. The major components of the bluffing behavior are spreading the neck, hissing, and striking. Death-feigning is preceded by contortions and shows variations in the positions of the mouth and tongue. The newly-hatched snakes exhibited both bluffing and death-feigning, indicating that the behaviors are innate.


An Introduction To The Ethology Of Citellus Variegatus, John W. Bell Jan 1974

An Introduction To The Ethology Of Citellus Variegatus, John W. Bell

Masters Theses

The above ground activity of the rock squirrel Citellus variegatus between November 6, 1972 and May 1, 1973, is described. This is a non-colonial species. Recognition was established between siblings by a nose to nose contact. In foraging they utilize almost any edible material available and during this time of year foraging is most intense between 11:00 a.m. and 4:00 p.m. Vocalization was limited to alarm calls, which brought the other squirrels to the top of the rocks to become alert, and squeals. Hibernation varied in length depending in part on the elevation and in some ...