 Mutualism is a form of symbiosis that is beneficial to both involved organisms.Mutualism has many forms and can occur when the benefits are immediate or deferred, when individuals exchange beneficial behaviors in turn, or when a group of individuals contribute to a common good, where it may be advantageous for all group members to help raise young.When a group raises young together, it may be advantageous because it maintains or increases the size of the group.