Assertion: human's behavior | /r/HasProperty | documented in about 500 species
Facets:
value: as of 1999
type: TEMPORAL
Source sentences:
text: Such behaviors include sexual activity, courtship, affection, pair bonding, and parenting, and are widespread; a 1999 review by researcher Bruce Bagemihl shows that homosexual behavior has been documented in about 500 species, ranging from primates to gut worms.
text: Bagemihl's research shows that homosexual behavior, not necessarily sexual activity, has been documented in about 500 species as of 1999, ranging from primates to gut worms.