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In page Yellow-billed stork:

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Before it was established that the yellow-billed stork was closely related to the American woodstork, the former was classified as belonging to the genus Ibis, together with the milky stork and painted stork.[3] However, the yellow-billed stork has actually long been recognised as a true stork[4][5] and along with the other 3 related stork species, it should not strictly be called an ibis.[3]