Assertion: starling's behaviour | /r/HasProperty | response
Facets:
value: to studies
type: OTHER
value: to overcrowding
type: CAUSE
Source sentences:
text: Researchers propose that swarming behaviour is a response to overcrowding and studies have shown that increased tactile stimulation of the hind legs or, in some species, simply encountering other individuals causes an increase in levels of serotonin.