Measuring the Temperature of Eggs during Incubation under Captive Falcons

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Abstract
Two PIM/FM [pulse interval modulation/frequency modulation] transmitters were implanted in dummy falcon eggs. One was incubated by a pair of praire falcons (Falco mexicanus) and the other by a pair of peregrines (F. peregrinus). Temperature data were recorded continuously on a strip chart. The egg incubated by praire falcons was rotated 3.5 .+-. 1.2 times both day and night, and had a mean internal temperature of 34.8 .+-. 0.9.degree. C; the egg incubated by peregrines was rotated 4.7 .+-. 1.0 times (day and night) and had a mean internal temperature of 35.7 .+-. 0.6.degree. C. The data suggested a lower incubation temperature than had been used previously (37.2.degree. C), so 5 prairie falcon eggs were incubated at 36.3.degree. C and 4 of the eggs hatched.

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