The loss of just three adult whales could spell extinction for the entire endangered sperm whale population in the Gulf of Mexico.

BP’s Deepwater Horizon disaster happened in prime sperm whale habitat. In fact, it couldn’t have really been in a worse spot, as sperm whales feed in the very canyon that millions of barrels of oil gushed into this summer. A dead juvenile sperm whale was already spotted in the area around the spill back in June. Now the Greenpeace ship Arctic Sunrise is in the Gulf to find out the true extent of the damage.

Tell Dr. Jane Lubchenco, the head of the National Oceanic and Atmospheric Administration, to protect the sperm whale and the entire Gulf ecosystem by establishing marine reserves in ecologically critical areas.