Wildlife experts are hoping to find out loads more about the grey seal after a record number of seal pups were born on the German island of Heliogland.
Grey seals set up home on the island in the North Sea about 20 years ago and are said to be doing really well.
It's thought having lots of fish to eat and no natural predators in the area has helped the number of newborn seals leap from 32 to 55 in the past year.
Experts are now tagging the pups so they can find out what they get up to.
Young seals tend to leave their birthplace for five or six years before returning home, and experts want to learn more about where they go and how they behave.