Playing King of the Hill

This spiny lobster at the Marine Lab was claiming the high ground for himself.

Meanwhile, these two fellas were duking it out in the valley.

 Although spiny lobsters resemble true lobsters, they are not closely related. They are known to migrate on the sea floor, in single files of 50 or more. There was a study published in 2007 that supported the theory that they navigate using the Earth's magnetic field.