What are some similarities of humpback whales and beluga whales?

There are a few similarities between the two species despite that one is toothed and the othered baleen. Both are mammals, obviously, so they have all those traits in common. They both have a layer of blubber that protects them from the freezing artic waters, they migrate to give birth to their young and feed, and both are very musical compared to other species of whale.