Threats to world's migratory animals greater than ever, says landmark UN report

During its nesting season, the marbled murrelet, known affectionately among bird watchers as a "strange, mysterious little seabird," lays a single egg in the thick mosses that grow on the branches of British Columbia's old-growth forest canopy.

With some of those forests under threat from logging, the small black-and-brown mottled seabird is considered threatened, too.

The marbled murrelet is among a growing number of migratory species animals facing a perilous future, a new UN report found.  

"The solution for the marbled murrelet and for a number of other migratory species is habitat protection," said Shelley Luce, campaign director of Sierra Club.

"Loss of habitat is one of the biggest drivers — in many cases the biggest driver — for species loss."

A report by a United Nations conservation group released Monday on the state of the world's migratory species found the threats to these animals, ranging from fish to birds to butterflies, are greater than ever. 

Nearly all of the fish the group is tracking — 97 per cent — are down in numbers, and birds aren't faring much better. 

Overall, more than one in five species listed by the group, are threatened with extinction and 44 per cent have a decreasing population.

Along with habitat loss, other human-caused impacts such as over-exploitation, pollution and climate change are making it harder for migratory species to survive, the report found. 

The report, entitled State of the World's Migratory Species, is the first of its kind. It was created by a UN-backed organization known as the Convention on the Conservation of Migratory Species of Wild Animals.

It comes two years after nearly 200 countries committed at a UN biodiversity conference in Montreal to halt and reverse the destruction of nature by 2030.

The findings underscore the importance of greater co-operation between countries to preserve habitats along migration routes, experts said. 

"Trying to conserve those species means working across borders and having coherent policies to try to help them," said Chris Guglielmo, a biology professor and director of the Centre for Animals on the Move at Western University in London, Ont.

The endangered monarch butterfly, for instance, flies from Canada and the U.S. to Mexico and back again every year.