The scythe butterflyfish, Prognathodes falcifer is a rare coolwater fish which comes from the East Pacific Ocean in southern california, USA to Baja California, Mexico. Apparently, this species occur in shallower waters in the U.S. where it is not legal to collect but it occurs in really deep waters in Mexico where it is possible but more difficult to collect. This species hasen’t been collected since 2001 so it is exceedingly rare in captive aquaria. There is a single pair of this relatively local beauty which has resided at the Denver Downtown Aquarium for 7 years in which time they have grown to become exceptional specimens. The video below was filmed just last week, we hope it tickles that fish fancier funny bone.