What is an example of mutualism in caribou?

An example of mutualism in caribou is their relationship with certain types of lichens, particularly reindeer lichen, which are a primary food source for them. The caribou help disperse lichen spores through their movement across the tundra, promoting the growth of these organisms. In return, the lichens provide essential nutrients and energy to the caribou, especially during harsh winter months when food is scarce. This mutually beneficial relationship supports both the caribou population and the lichen ecosystem.