There is no analogy with the cases of goats and other animals suckling strange species; because in those instances there is the motive-at all events in the beginning-of relief from the painful pressure of the milk.
"Wild Life in a Southern County"
Richard Jefferies
Just as they turned a bend, they saw a small brown cow, suckling her calf, along with several other cows in a nearby pasture.
"The Human Side of Animals"
Royal Dixon
Dr. Felton declares we began to refine our Language much sooner than the French, and that the Writers in Queen Elizabeth's Reign are far preferable to Shakespear, Fletcher, Waller, suckling, May, Sands, and all the Writers from the Gunpowder Plot to the Restoration.
"An Essay on Criticism"
John Oldmixon