UK households warned to check on blackbirds when they enter your garden

Scientists have urged those with flitting around their to watch out – as they may be carrying a horrifying mosquito-borne .

Alarms have been raised after almost half the species’ population has been killed by the sickness. Known as the Usutu virus, it has decimated the London blackbird population by about 40% since 2020. Now the disease is spreading rapidly across the UK and, in particular, southern England. To combat its spread, garden-owners have been urged to monitor any blackbirds that they see in their garden.

Dr Arran Folly from the Animal and Plant Health Agency (APHA) told the : "We've seen that the virus has spread further than we thought it might do, and it's persisted. Blackbirds specifically are quite susceptible to the virus.”

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He added that its prevalence indicates that the UK might see other viruses that are transmitted by mosquitoes beginning to emerge. Particularly in warmer weather conditions.

Scientists from the APHA in Weybridge, Surrey, have warned this may be linked to climate change. Hotter temperatures and heavier rainfall make it easier for mosquitos to spread in climates previously inhospitable to them.

The Usutu virus was first discovered in southern Africa 80 years ago as a deadly zoonotic disease that mainly spread between mosquitos and birds. It was first detected in Austria in 2001 and has been spreading through Europe since.

It reached the UK in 2020, where it was picked up for the first time after several blackbirds in the London area were found to be carrying it, following that year’s summer .

Signs that a blackbird may be suffering from Usutu include weakness and lethargy, poor co-ordination, ruffled feathers and a drooping head or wings. They also display a reluctance to fly.

More seriously, watch out for birds suffering from seizures or gasping for breath. Although, it’s important to remember that they may not display any obvious signs.

The virus can be highly deadly, as it infects multiple organs in the bird’s body. This includes the kidneys and the brain.

Scientists and The British Trust for Ornithology are calling for volunteers to count blackbirds in their gardens over the summer months. This is to help them find out more about the comings and goings of the birds.

As reported by , The British Trust for Ornithology said: "The Blackbirds in Gardens project will help us understand how Blackbirds use gardens, and the potential effects of the Usutu virus on their population in the UK.” The survey will run until September and takes 15 minutes to complete.