Nearly half of migratory species in decline as UN summit opens

A blue whale raises its tail off the California coast, part of a species known for long-distance migration in search of food and breeding grounds. AP - Nick Ut

A United Nations summit on migratory species opens in Brazil on Monday as scientists warn that the long journeys of whales, fish, birds and other animals are being disrupted by climate change and human activity – with risks for ecosystems, food supplies and coastal economies.

Cop15 brings together governments to protect animals that move across borders and oceans.