Huffington Post: My visit to Heron Island revealed that evolution does not always generate elegant or even obviously efficient solutions. Instead, the island ecosystem, with its bird-killing trees and turtle-gobbling sharks, is built on what appear to be profligately inefficient exploitation of the rich resources generated by the reef. To me, the coral reef, with its myriad species and complex food webs, seems fully-realized and enduring, while the relatively few island species form an ecosystem that seems more tenuous...