He took them under his wing! Big Apple billionaire John Catsimatidis launched a crusade to save ostriches from being killed on a farm in Canada after a heartfelt appeal from one of the farmers — and now US officials are offering to take in the birds for research purposes, The Post has learned. But despite the efforts of the animal-loving supermarket mogul and American officials to save the ostriches, nearly 400 of the animals could still be slaughtered as soon as Friday at the Universal Ostrich