Pete Oxford / Marine Iguana (Amblyrhynchus cristatus) feeding on Sea Lettuce (Ulva sp), Santiago Island, Galapagos Islands, Ecuador

Pete Oxford / Marine Iguana (Amblyrhynchus cristatus) feeding on Sea Lettuce (Ulva sp), Santiago Island, Galapagos Islands, Ecuador

Pete Oxford / Marine Iguana (Amblyrhynchus cristatus) feeding on Sea Lettuce (Ulva sp), Santiago Island, Galapagos Islands, Ecuador

Ingo Arndt / Sea Lettuce (Ulva lactuca) algae twenty one centimeters, Helgoland, Germany

Michael & Patricia Fogden / Weka (Gallirallus australis), Ulva Island, Stewart Island, New Zealand

Michael & Patricia Fogden / Weka (Gallirallus australis) flightless bird endemic to New Zealand, Ulva Island, New Zealand

Michael & Patricia Fogden / Weka (Gallirallus australis) flightless bird endemic to New Zealand, Ulva Island, New Zealand

Gary Bell/ Oceanwide / Sea Lettuce (Ulva australis) and other alga, Yorke Peninsula, South Australia, Australia

Gary Bell/ Oceanwide / Sea Sweep (Scorpis aequipinnis) in Sea Lettuce (Ulva australis), Hopkins Island, South Australia, Australia

David Hall / Split-level of Cormorants (Phalacrocorax sp.) standing on rocks with Sea lettuce (Ulva sp.) seen underwater, Hussar Bay, Nigei Island, Queen Charlotte Strait, British Columbia, Canada. September.