Assertion: female elephant | /r/HasProperty | ready to mate
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Source sentences:
text: When a female elephant is ready to mate, she produces a certain sound which is loud enough to be heard by other elephants.
text: When a female elephant (or ‘cow’) is ready to mate – which can happen at any time of year and under any circumstances – she sends out an infrasonic signal that is heard by males (or ‘bulls’) up to many tens of miles away.
text: When a female elephant is ready to mate, bull elephants living solitarily in the surrounding area begin to congregate around her herd.