Seals & Dolphins
Harbor Seal
Harbor seals are not uncommon in the winter, but kayaking is, so don't expect to encounter them when you are out for a paddle.
-- Wikipedia
Common Dolphin
On the other hand, the Common Dolphin prefers warmer weather, and can be seen all through kayaking season. They go south for the winter.
-- Wikipedia
These are some mammals you are likely to see in and around the water.
More: Mammals ...