Spizella arborea - American Tree Sparrow XC121042.ogg
Global Biodiversity Information Facility
Interim Register of Marine and Nonmarine Genera
Open Tree of Life reference taxonomy version 3.6
AVIAN BODY SIZES IN RELATION TO FECUNDITY, MATING SYSTEM, DISPLAY BEHAVIOR, AND RESOURCE SHARING
The worldwide variation in avian clutch size across species and space
National Library of Israel Names and Subjects Authority File
Out of the dark: 350 million years of conservatism and evolution in diel activity patterns in vertebrates