I didn't know this so I looked up the number for farm chickens, according to University of Kentucky (seems appropriate) they have a body temperature of "between 105°F and 107°F (40.6° and 41.7°C) ... Smaller chicken breeds have a higher body temperature than larger breeds"
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<a href="https://afs.mgcafe.uky.edu/poultry/chapter-7-air-temperature" rel="nofollow">https://afs.mgcafe.uky.edu/poultry/chapter-7-air-temperature