Kelley J. Kissner, R. Mark Brigham, Evidence for the Use of Torpor by Incubating and Brooding Common Poorwills Phalaenoptilus nuttallii, Ornis Scandinavica (Scandinavian Journal of Ornithology), Vol. 24, No. 4 (Oct. - Dec., 1993), pp. 333-334
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Kissner et al. (1993) studied this question.
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