Thermal conductance in birds and mammals

摘要: Abstract 1. Thermal conductance ( C measured in cal.g −1 hr °C ) birds, mammals and lizards is exponentially related to body weight W g). The equation developed for thirty-one species of birds log = 0·662 − 0·536 while the relationship twenty-four 0·691 0·505 . There no significant difference between these curves. 2. Conductance varanid ten times higher than intact four defeathered birds. high partly because measurements were made an air stream up 300 cm/sec their large skin surface. 3. Heat loss two three greatest increase occurred larger suggesting greater insulation resides feathers.