The iceberg broke away from a huge ice barrier in the Antarctic after some freak weather and floated into the Ross Sea, where the penguins live at a place called McMurdo Sound.
'Major catastrophe'
Around 1,000 rare Emperor penguins are thought to have died already, and another quarter of a million birds are in danger.
Wildlife experts are keeping an eye on them but they are worried the penguin's problems could turn into a "major catastrophe".
