Assertion: hummingbird | /r/CapableOf | become alert
Facets:
Source sentences:
text: In this state of torpor, they become hypothermic, conserving 50 times less energy, have almost no pulse and only become alert when approached.
text: During this time, the hummingbirds cling to a branch and sit almost lifeless; sometimes their feet (which are known to be quite weak) will loosen their grasp enough to swing downwards and hummingbirds remain hanging upside down on the branch until the next morning or until they become alert when approached.