Tawny (or Raspberry) crazy ants (Nylanderia fulva) are an invasive ant species from South America that have been invading the United States. For some reason, the ants are attracted to electronics and have been responsible for the destruction of numerous electronic devices.
A new study shows that tawny crazy ants rub formic acid over their bodies as a shield against fire ant venom. This conclusion came after researchers observed the ants rubbing themselves with formic acid after a confrontation with fire ants (see image below). The substance can also be used as a weapon when sprayed on their enemies. These strategies allows them to out-compete fire ants and some suspect that crazy ants may invade fire ant nests as they are sometimes found inside their mounds.