Scientists may finally have an explanation for the longstanding mystery of why blue whale calves are rarely sighted, an advance that could help better conserve the critically endangered species.

blue whale and Florida manatee. Each of these species is already so depleted that the loss of only a few individuals can mean the difference between moving toward recovery or being pushed further ...

blue whale and Florida manatee. Each of these species is already so depleted that the loss of only a few individuals can mean the difference between moving toward recovery or being pushed further ...