Pushover penguins?
(Science Briefs, Boston Globe, 2/27/2001)
Apparently penguins aren't the pushovers that environmentalists had feared. Following rumors that, during the 1982 Falklands war, penguins watching aircraft flying overhead would lose their balance and tip over, people have worried that extra precautions might need to be taken in order not to bother them. Now Richard Stone of the British Antarctic Survey has reported on a five-week study of about a thousand king penguins watching Lynx helicopters fly overhead. Apparently not a single one fell over.
ref: New Scientist, Feb. 10.