Abstract
Caprimulgid birds have proved to be intriguing subjects for physiological research. Some, the Poor-will (Phalaenoptilus nuttallii), the Common Nighthawk (Chordeiles minor), and the European Nightjar (Caprimulgus europaeus), have been observed to become dormant under appropriate conditions in the field or laboratory (Jaeger 1948, 1949, 1954; Thorburg 1953; Marshall 1955; Novrup 1956; Bartholomew et al. 1957; Howell and Bartholomew 1959; Bartholomew et al. 1962; Lasiewski and Dawson 1964; Peiponen 1965, 1966). Several, the Poor-will, Common Nighthawk, and Lesser Nighthawk (Chordeiles acutipennis), have been found to excel in their resistance to
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