Although not as menacing as a great white, the zoo says the pair are anything but ordinary and have an important job.

Their pectoral fins are unusual, having a “shoulder” and an “elbow” joint, which somehow gives them the ability to skitter over the mud and even jump (with the aid of the tail).

Most species of sea robins are bottom-dwellers that both swim and crawl around on “legs” that extend from their pectoral fins. An international team of researchers has now discovered that the ...