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New research on Greenland’s sleeper shark has found it to be the slowest fish in the sea relative to its size. In order to compensate for this slowness, sleeper sharks attack seals as they sleep.

After studying the Greenland sleeper sharks, researchers found that they moved about .76 miles per hour. This sluggishness can be partly explained by the cold temperatures of the Arctic waters, where fish tend to compensate for the cold by using more muscle fibers for some tasks or by having cold-adapted muscle fibers.

The sleeper sharks studied, however, didn’t ever seem to move fast enough to catch a live seal except while it sleeps. Sleeper sharks have been reported to eat harbor seals, ringed seals, hooded seals, and bearded seals.

Read more about the sleeper shark here.