Their pectoral flippers are spatulate shaped.
Here is a pair of right whales that were very active at the surface, rolling over and around each other. At this time of the year right whales can been seen in SAG's, surface active groups. Right whales mate and court in large numbers with their reproductive strategy based on sperm competition. One of the right whales "claim to fame" is that testes of the male weigh up to 1 ton combined, the largest in the animal kingdom.
The large, smooth, deeply-notched tail is distinct and helps make the right whale easy to identify. They also have no dorsal fin, callosities on the head and a tall, V-shaped blow.
We may end up doing another right whale trip in September, so I will keep you posted. I plan on taking my camera out tomorrow, and I will let you all know what we are seeing.