Lofoten, Greenland, Svalbard, Iceland. Sperm whales usually eat a little over kg almost 2, pounds of food per day. To find their prey preferably giant squid , they dive somewhere between and 1, metres and 4, feet , though they can go as deep as 2 km 1. An average dive lasts about an hour. When hunting smaller fish, sperm whale pods can work together to force feeder fish into ball-like clumps that are more substantial to eat than individuals.