Assertion: resident hummingbird | /r/CapableOf | strengthen its territorial claim
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Source sentences:
text: When a resident hummingbird spots an intruder, it may raise the volume or quicken the pace of its songs and calls to advertise and strengthen its territorial claim.
text: When a resident hummingbird spots an intruder, it may raise the volume or quicken the pace of its songs and calls to advertise and strengthen its territorial claim.