While the grey seal population has decreased in the past centuries, Estonian sea today makes a home to about 4000 animals. Grey seal is the largest marine mammal in the Baltic Sea weighing up to 300 kilograms.
The main seal species you may encounter in Estonia are the grey seal and ringed seal. The ringed seal tends to be very sensitive to pollution and thereby hides far from human habitats in the Finnish Gulf nearby Russia.
Seals are a curious bunch. Many previous travellers have witnessed grey seals' love of music. If you have a musical instrument handy, it might be an idea to bring it along with you. In general, grey seals tend to chill on the rocks and swim around the boat going human watching from the water.