Nine rare whale calves spotted in North American waters

Nine rare North Atlantic right whale calves have been spotted in North American waters. The population of right whales has been declining for more than a decade. But as Nathalie Sturgeon explains, researchers see this as a positive sign for the endangered species.

• Tracing fishing gear to protect North Atlantic right whales is positive step: experts
• Endangered North Atlantic right whale baby found dead near North Carolina
• Nine right whale calves spotted in Atlantic Ocean: researchers