The area where tigers live is getting smaller and smaller and threatening their existence.
That's what research by four conservation charities has uncovered - and they're calling for something to be done to protect the remaining big cats.
Tigers now have 40% less area to roam than they did just 10 years ago.
The main cause for their decline is humans taking over their land, and some tigers are being hunted for their skins or body parts.
The conservation groups' study has identified 76 areas in the world where tigers could thrive with proper protection.
They say long-term success depends on local people working together.