Page "Oceania ecozone" Paragraph 3

Since the islands of Oceania were never connected by land to a continent, the flora and fauna of the islands originally reached them from across the ocean ( though at the height of the last ice age sea levels were much lower than today and many current Seamounts were islands, so some now isolated islands were once less isolated ).

Once they reached the islands, the ancestors of Oceania's present flora and fauna adapted to life on the islands.

Larger islands with diverse ecological niches encouraged floral and faunal adaptive radiation, whereby multiple species evolved from a common ancestor, each species adapted to a different ecological niche ; the various species of Hawaiian honeycreepers ( Family Drepanididae ) are a classic example.

Other adaptations to island ecologies include gigantism, dwarfism, and, among birds, loss of flight.

Oceania has a number of endemic species ; Hawaii in particular is considered a global ' center of endemism ', with its forest ecoregions having one of the highest percentages of endemic plants in the world.