Nearly half of the world's migratory species are in decline, UN report says

Nearly half of the world's migratory species are in decline, according to a new United Nations report released Monday.

Many songbirds, sea turtles, whales , sharks and other migratory animals move to different environments with changing seasons and are imperiled by habitat loss, illegal hunting and fishing, pollution and climate change. About 44% of migratory species worldwide are declining in population, the report found . More than a fifth of the nearly 1,200 species monitored by the U.N. are threatened with extinction. "These are species that move around the globe. They move to feed and breed and also need stopover sites along the way," said Kelly Malsch, lead author of the report released at a U.N. wildlife conference in Samarkand, Uzbekistan.

Habitat loss or other threats at any point in their journey can lead to dwindling populations. "Migration is essential for some species. If you cut the migration, you're going to kill the species," said Duke University ecologist Stuart Pimm, who was not involved in the report. The report relied on existing data, including information from the International Union for Conservation of Nature's Red List , which tracks whether a species is endangered. Participants of the U.N. meeting plan to evaluate proposals for conservation measures and also whether to formally list several new species of concern.

An elephant head wall trophy is on display at the Nesbitt Castle in Bulawayo, Zimbabwe, in this April 23, 2018 file photo. Nearly half of the world's migratory species are in decline, according to a new United Nations report released Monday, Feb. 12, 2024. Many songbirds, sea turtles, whales, sharks and migratory animals move to different environments with changing seasons and are imperiled by habitat loss, illegal hunting and fishing, pollution and climate change. Credit: AP Photo/Jerome Delay, File Read more

This Wednesday, March 6, 2019 photo provided by the NOAA Hawaiian Islands Humpback Whale National Marine Sanctuary shows an entangled subadult humpback whale that was freed of gear by a team of trained responders off Makena Beach, Hawaii. Nearly half of the world's migratory species are in decline, according to a new United Nations report released Monday, Feb. 12, 2024. Many songbirds, sea turtles, whales, sharks and migratory animals move to different environments with changing seasons and are imperiled by habitat loss, illegal hunting and fishing, pollution and climate change. Credit: Ed Lyman/NOAA Hawaiian Islands Humpback Whale National Marine Sanctuary via AP, File Read more

A researcher uses a clothes hanger to secure a geo-locator in place on the leg of a Red Knot shore bird while the glue dries on the north end of Nauset Beach in Eastham, Mass., Tuesday, Sept. 17, 2013. Nearly half of the world's migratory species are in decline, according to a new United Nations report released Monday, Feb. 12, 2024. Many songbirds, sea turtles, whales, sharks and migratory animals move to different environments with changing seasons and are imperiled by habitat loss, illegal hunting and fishing, pollution and climate change. Credit: AP Photo/Stephan Savoia, File Read more

A volunteer carries a Green Sea Turtle after it was caught temporarily at a feeding site on Itaipu Beach in Niteroi, Brazil, Wednesday, May 24, 2023. Nearly half of the world's migratory species are in decline, according to a new United Nations report released Monday, Feb. 12, 2024. Many songbirds, sea turtles, whales, sharks and migratory animals move to different environments with changing seasons and are imperiled by habitat loss, illegal hunting and fishing, pollution and climate change. Credit: AP Photo/Silvia Izquierdo, File Read more