Abstract
The perching behavior of evening grosbeaks (Hesperiphona vespertina) and pine grosbeaks (Pinicola enucleator) was monitored in a cage to test for radiation-induced spatial avoidance. The cage, consisting of two identical halves with one side shielded, was located in an experimental γ-radiation field. The unshielded side was exposed to 90.8 R/day, 36 times greater than the shielded side. During a 66-hr stay in the cage, birds did not discriminate between the two sides, suggesting that they could not detect and hence avoid potentially harmful radiation exposure. These results conflict with those of a field study in which other species of birds selected nest sites on the basis of radiation levels, apparently avoiding high radiation exposures.
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