Southern Resident Orcas or SRO’s are considered the most researched group of orcas on the planet. Consisting of J, K and L pods, these orcas have all been designated numerical identification and names. They are called Southern Residents because it was thought that the Salish Sea is where they spent most of their time, however, studies show that there are trends in where they spend their time.They used to be seen frequently May through September, but now they are mostly absent from April through August. The Southern Resident Orcas were officially listed as endangered in November 2005.