What type of symbiosis is ants crawling all over a dead worm?

The relationship between ants crawling all over a dead worm is an example of scavenging, which can be considered a form of commensalism. In this interaction, the ants benefit by feeding on the decaying matter without harming the worm, which is already dead. The dead worm does not gain any benefit from the ants, illustrating a one-sided relationship where one organism benefits while the other is unaffected.