Assertion: patella | /r/CapableOf | evolve within bird
Facets:
value: repeatedly
type: TEMPORAL
Source sentences:
text: The avian, lizard (squamatan) and mammalian patellae evolved independently from each other ( Dye, 1987 ; Sarin et al., 1999 ), but it is unclear when and in what form the avian patella first evolved, and whether it might also have evolved repeatedly within birds.