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- (biology) The mutual exchange of (fluid) food between individuals, especially in social insects.
- Trophallaxis is at its most highly developed in social insects such as ants, wasps, bees and termites, but is also used by some birds, and by wolves and vampire bats.
- The exchange may be mouth-to-mouth or, more rarely, anus-to-mouth. The former may be termed stomodeal trophallaxis, while the latter is called anal, abdominal or proctodeal trophallaxis.