dorsal

These overstimulated immune cells then move toward the dorsal root ganglia -- the sensory nerve hubs that link the limbs to the spinal cord -- and release inflammatory compounds that irritate and damage nerves.

"One of the sightings reported a group of single male outer coast orcas slapping each other with their dorsal fins and charging at inner coast females."

They crawled around blowholes and dorsal fins, and soon each human was sitting on the back of their very own whale.

Each encounter was carefully recorded, and the individual orcas were identified by markings on their dorsal fins.

"A dorsal fin slowly broke the surface revealing that familiar profile that looked like a shark," he said.