Robots designed to move like ants could one day help search collapsed buildings, according to US scientists.
A team from the Georgia Institute of Technology is studying ants to see how they build their tunnels.
The findings could help build better rescue robots in the future.
Prof Dan Goldman explained: "Lots of the materials in disaster sites are loose materials, which you're going to potentially have to create structures out of."
"You might want, for example, to create a temporary structure for people buried down beneath."
Learning from the ants might enable designers to build robots that solve these problems.
Fire ants can build stable tunnels in almost any material - even loose sand.