Migratory birds are disappearing

In 2008, 11% of migratory birds were classed by BirdLife International as threatened or near-threatened on the IUCN Red List. Red List indices show that these migrants have become more threatened since 1988, with 33 species deteriorating and just six improving in status.
Analysis of the main threats shows that there are two key pressures which affect nearly 80% of migratory species. These pressures are agriculture which results in habitat degradation and loss, and biological resource use which includes threats such as deforestation and unsustainable hunting. Other important threats include collisions with wind turbines, , electrocution by powerlines, deliberate persecution, poisoning, pollution and disturbance during the breeding period, and. Many existing threats are likely to be exacerbated by climate change.

source: BirdLife International