A lost baby humpback whale who broke the world's heart when it nuzzled ships near Sydney was put down today with an overdose of anesthetic, reports the Australian. Experts say the calf, dubbed Colin, had no chance of surviving. The whale had been attacked by sharks and needed several months of nursing, which Australian marine facilities could not provide. Critics blasted the decision to kill the calf, who thrashed and bucked as it died, witnesses said. (More baby whale stories.)