Assertion: heron | /r/CapableOf | introduce possibility
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Source sentences:
text: Herons, Egrets, Flamingos, Ibises, Night-Herons, Spoonbill & Stork Ardeidae, Ciconiidae, Phoenicopteridae & Threskiornitidae Information, images and range maps on over 1,000 birds of North America, including sub-species, vagrants, introduced birds and possibilities