Assertion: lion's group | /r/HasProperty | the core of zoo exhibits
Facets:
value: since the late eighteenth century
type: TEMPORAL
Source sentences:
text: Lions are part of a group of exotic animals that are the core of zoo exhibits since the late eighteenth century; members of this group are invariably large vertebrates and include elephants, rhinoceroses, hippopotamuses, large primates, and other big cats; zoos sought to gather as many of these species as possible.