Goldfish
The goldfish ("Carassius auratus") is a freshwater fish in the family Cyprinidae of order Cypriniformes. It is one of the most commonly kept aquarium fish.
Common paradise kingfisher
The common paradise kingfisher is found in the forested interior of New Guinea and on some of the offshore islands to the north. Its distribution is rather patchy and it mostly occurs below on the mainland and on Karkar Island. On some islands it is replaced by sister species; the Biak paradise kingfisher ("T. riedelii") on Biak Island; the Kofiau paradise kingfisher ("T. ellioti") on Kofiau Island; and the Numfor paradise kingfisher ("T. carolinae") on Numfor Island. It seems that each of these island species originated from founding "T. galatea" birds which became isolated from the mainland birds and underwent a "genetic revolution". There were no particular biotic factors involved, but there was sufficient variation among the founding birds to encourage speciation, and the assortment of genes that the birds on each island received was later undisturbed by the inflow of alien genes.