Aircraft livery Airlines' 1975 livery was among the first Eurowhite schemes outside Europe. The Braniff 1967 livery (see Overal Colour above) was also often dubbed "Jellybean." Jellybean liveries involve multiple alternative colourways in which entire aircraft or parts of them are decorated. A Jellybean variant involved decorating tail fins in different designs, as exemplified by Air India Express, displaying different Indian culture and heritage on its tail, Alaska Air's brand refresh livery, Frontier Airlines with the images of different animals and birds on its tail, JetBlue Airways, Mexicana, Pakistan International Airlines' "ethnic tails," and PLUNA. British Airways’ 1997 ethnic liveries were celebrated
Fish fin evolved a dorsal fin and tail fin for improved aquatic locomotion. These structures are all the more remarkable because they evolved from nothing — the ancestral terrestrial reptile had no hump on its back or blade on its tail to serve as a precursor." The biologist Stephen Jay Gould said the ichthyosaur was his favorite example of convergent evolution. Fins or flippers of varying forms and at varying locations (limbs, body, tail) have also evolved in a number of other tetrapod groups, including diving birds such as penguins (modified from wings), sea turtles (forelimbs modified into flippers), mosasaurs (limbs modified