What is the difference between the populations of North and South Pacific?
The humpbacks of the North Pacific (Alaska, Canada, Hawaii, Japan, Mexico) are usually a little darker on the underside of their flukes, their pectoral fins, bellies, and their throat grooves compared to the population of the South Pacific (Antarctica, Australia, South Pacific Islands). While many of the humpbacks sing head down to Hawaii, it's the opposite in the South Pacific. There may be many other differences as well and both populations are being closely studied.
