The Thirteenth Meeting of the Conference of the Parties to the Convention on the Conservation of Migratory Species of Wild Animals, or CMS COP13, is taking place as the world faces the threat of losing one million species to extinction unless protective efforts are increased.
"COP13 comes at a critical time for wildlife conservation, with continued downward trends of habitat loss and species decline," said CMS Executive Secretary Amy Fraenkel.
"The conference will set in motion actions needed to better protect migratory species that rely on multilateral cooperation for their survival."
COP13, which runs through 22 February, is being held under the theme "Migratory species connect the planet and together we welcome them home".
These creatures bring multiple benefits to humans, such as seed dispersal and pollination, and provide economic benefits and jobs such as in the tourism sector, for example.
"These species move between countries without any passports or visas, but are messengers of peace and prosperity, and it is our responsibility to protect that," said Indian Prime Minister Narenda Modi in his keynote address.
However, with increased warming and other weather extremes becoming the norm, migratory animals, as well as ecosystems, are also being affected.
CMSGlobal map of animal migration.
Delegates at the meeting will consider the need for guidance and other measures to mitigate the impact of roads, railways and other infrastructure on migratory species, which can injure or kill birds and other animals, increase pollution and cut through natural habitats.
As countries work to prevent global temperature rise from exceeding 1.5 degrees Celsius, in line with the Paris Agreement on Climate Change, they will also discuss ways to ensure biodiversity and migratory species are considered in national policies to promote renewable energy that is "wildlife-friendly".
Other deliberations will cover strengthening initiatives to combat the illegal killing and trade of migratory birds, and targeted action against aquatic wild meat, including from shark and ray species, which is a fast-emerging threat.
Other events taking place in 2020 include the Ocean Summit in June, a UN 'nature summit' in September and the UN Biodiversity Conference at the end of the year.
Said UNEP chief Joyce Myusa: "As we face the unprecedented crisis of species loss, 2020 is an important year to step up action to conserve species, protect ecosystems and make meaningful progress towards achieving the sustainable development goals. We must seize every opportunity we have, and the CMS COP is critical milestone in enabling biodiversity to flourish on this planet."
The Convention on the Conservation of Migratory Species (CMS) - the UN's environmental treaty - is the only global convention that protects these animals.
It contains two appendices: one covering endangered migratory species, while the other lists animals with "an unfavourable conservation status", requiring international action.
A new report to be released at COP13 indicates that despite some success stories, the populations of most migratory species covered by the Convention are declining.
Ten new species are expected to be added to the Convention, including the Asian Elephant, Jaguar and the Great Indian Bustard: the mascot of COP13.
Meanwhile, 12 animals currently included in the appendices are showcased in the latest series of UN Endangered Species stamps, issued on Monday.