Many species sleep for an entire season or travel from one continent to another every year. For all species I know all of these recurring events occur in a period of one year. One might refer to these species as 1-year-cycle species.
I wonder whether there are any 2-year cycle species. For example one that travels to some place not every but only every other year or sleeps for an entire year, before becoming active again.
I don't know any and I just started to wonder whether there is an evolutionary argument for this.