When I kill an ant and smell the carcass of the end, there seems to be a very weird smell. What is that smell?

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Depends on the species of ant.  There are thousands and many can be identified solely by their smell.  
https://www.wired.com/2015/06/ants-smell-like-blue-cheese-pine-sol/#:~:text=The%20True%20Odor%20of%20the%20Odorous%20House%20Ant.&text=With%201%2C000%20species%20of%20ants,smells%20a%20bit%20like%20vinegar....Show more