A jaw-dropping Reddit video is giving viewers a rare look at one of the ocean's most spectacular group displays. According to the post in a nature-themed Reddit forum, roughly 5,000 dolphins were seen moving together in a mile-long "stampede" near San Clemente in Southern California. The clip has racked up more than 24,000 upvotes and hundreds of comments as viewers marvel at the sheer size of the pod. In the footage, dolphins appear to stretch…