" The "cursorial model" of the evolution of one of their characteristic behaviors was modified into the WAIR hypothesis.
Nadya Medentseva theorized that the evolution of this clade was driven by the loss of thermogenicity of the protein UCP1. The discrepancy between the projected age of fossils of these organisms and their actual discovered age is termed the "temporal paradox." The "cursorial model" of the evolution of one of their characteristic behaviors was modified into the WAIR hypothesis. Based on DNA-DNA hybridization studies, Charles Sibley and Jon Edward Ahlquist put forth a taxonomy of them. Sexual selection led these animals to develop a unique secretion composition in their (*) uropygial gland. David Lack discovered that these organisms adapted to higher latitudes by increasing their clutch size. A scientist who was flummoxed by the tail of one of these organisms studied fifteen species of their subfamily Geospizinae in an early elucidation of adaptive radiation. The genus Archaeopteryx represents an evolutionary transition between dinosaurs and these animals. For 10 points, name these feathered, beaked, egg-laying vertebrates.
Nadya Medentseva theorized that the evolution of this clade was driven by the loss of thermogenicity of the protein UCP1.
birds [or avians; or Aves; prompt to be less specific on peacocks, finches, and other specific birds] 