Any suggestions with this little problem is most welcome.
My smart Lasius nigers have found that they can go out and explore outside their set up. They are squeezing threw the metal of the lid and glass where the lid sits (Starter set A from Antstore). I cannot use PTFE etc.. here as it is where the lid goes on and off! The lid looks like it sits right and seals, but they still squeeze threw! The main problem, is they come back to the nest from feeding somewhere and can't get back in!! I had 4-8 dead workers around the outside of the farm when I came back from holidays after two weeks.
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