Gregory's ServerIt's a kind of stridulation. A warning sound. I have not found any recordings of it (they are woefully understudied) but it's probably similar to this:
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 There are several ants who can squeak too. It's not typical. They tend to be more basal things like Dinoponera I think. Dinoponera are very "waspy"  |
@futurebird whoaaa can other wasps make noise? or ants?