This spooky scene from Sindh in Pakistan is an unexpected side effect from the huge floods that hit the country last year...
When the flooding hit last July and August, millions of spiders climbed onto the trees to escape the water. The pics are from the UK Department for International Development.
But because the flooding was so huge and has taken so long to drain away, the spiders have stayed in the trees - and cocooned them in spiderwebs!
People living in Sindh say they've never seen anything like this before. They've also noticed fewer mosquitoes around since it happened.
It's thought the mosquitoes are getting caught in the spiderwebs. It's a small relief for people recovering from the floods because mosquitoes spread the deadly disease malaria.
The British government has been working hard to help the flood victims, providing things like healthcare and trying to get thousands of kids back to school.