• Publications
  • Influence
Variations in the Weight of Birds
  • 189
  • 5
Measurement of Bird Populations
  • 218
  • 4
Territorial and mating behavior of the house wren, with 32 figures,
"Contribution from the Baldwin Bird Research Laboratory, no. 37 and from the Zoological laboratory of the University of Illinois, no. 582."
  • 101
  • 4
Birds of a Prairie Community
  • 46
  • 4
The Role of Environment in the Life of Birds
  • 113
  • 3
Tolerance of Cold and Bergmann's Rule
As size is well known to affect the energy relations between an endotherm and its environment, one would expect that size may also influence or be related to geographic distribution. Bergmann's RuleExpand
  • 127
  • 3
  • PDF
Resistance to Hunger in Birds
importance to birds, especially in the winter when air temperature may also be low. Hunger becomes more quickly critical at low air temperatures because general metabolism is higher and more energyExpand
  • 47
  • 3