The bird's migration distance is long

The migratory bird's route will be longer, according to the first study on the impact of climate change on migratory birds. The migration distance of some species may increase to 400km.

The main author, Nathalie Doswald of the University of Durham (UK), said: 'The predicted temperature changes and habitat changes can have serious consequences for many animals'.

A research group - under the direction of Durham University and funded by RSPB (BirdLife in the UK) and the Natural Environment Research Council - investigated the Sylvia warbler migration cycle in Europe, a group birds are often found in Europe, such as the ancient warbler Sylvia communis and Blackcap Sylvia atricapilla.

Dr Stephen Willis, head of research at Durham University, said: 'Our findings show that the migratory routes of some birds will last longer. This is not a good news for birds, such as the ancient warbler. '

About 500 million birds are estimated to migrate from Africa to Europe and Asia. The birds, the smallest of about 9 grams, migrate annually over thousands of miles between the two continents to find suitable food and climate.

The 'marathon' migratory route of some birds - for example, an ancient sting bird - will be longer.(Photo: BirdLife / Roger Tidman (rspb-images.com))

Dr. Willis added: 'Most warblers come here in the spring and summer to take advantage of the abundance of insects, and leave in the fall. From 2071 to 2100, 9 of the 17 species we studied are expected to have longer migrations, especially those that fly through the Sahara '.

The co-author of the study, Professor Rhys Greeen of Cambridge University and RSPB, said: 'These little birds are doing amazing journeys, pushing themselves to the limits of suffering. Anything that makes these trips become longer and more dependent on rare requests to 'refuel' can lead to the difference between life and death. '

Professor Green stressed: 'We have found evidence that the bird's distribution area is moving northward in search of suitable environmental conditions. This latest research shows that their arduous journeys will last longer. '

Due to the worrying decline of many migratory species, Birdlife launched the Born to Travel campaign to protect migratory birds along the African-European Asia route. Richard Grimmet, BirdLife's chief conservation officer, said: 'Birds have a lot of risk in their annual migration journey.'

He added: 'BirdLife and its partners are working hard to create a safer flight cycle for migratory birds. We have partners in over 70 countries along migration routes between Europe, the Middle East and Africa, and are currently working together to address threats to migratory birds such as desertification. , deforestation, and climate change '.