Police hope to follow their noses to catch thieves who stole three-and-a-half tonnes of manure.
The manure was in a large trailer which was taken from a country lane in Wookey, Somerset.
The smelly cargo was stolen overnight last Thursday, police said.
A spokeswoman said: "The trailer was full of manure, but it was probably the trailer they were after."
Contact Wells Police Station on 0845 4567000.