 Satellite tracking is especially useful because the scientists do not have to follow after the animal nor do they have to recover the tag to get the data on where the animal is going or has gone.Satellite networks have tracked the migration and territorial movements of caribou, sea turtles, whales, great white sharks, seals, elephants, bald eagles, ospreys and vultures.Additionally Pop-up satellite archival tags are used on marine mammals and various species of fish.