Ashley Cooper / Kelp goose (Chloephaga hybrida) pair at Gypsy cove, near Port Stanley, Falklands slands.

Chris Mattison / Gutweed (Enteromorpha intestinalis) growing in shallow rock pool, Isle of Ulva, Mull, Scotland, June.

Philippe Clement / Gutweed / grass kelp (Enteromorpha intestinalis / Ulva intestinalis) washed ashore on Normandy coast, France, September

LYNN M. STONE / Wood Stork (Mycteria americana) adult striding across marine grass and kelp during extreme low tide. Tarpon Springs, Florida, USA, November.

LYNN M. STONE / Wood Stork (Mycteria americana) adult striding across marine grass and kelp during extreme low tide. Tarpon Springs, Florida, USA, November.

Flip Nicklin / Bull Kelp (Nereocystis luetkeana) and sea grass waving in underwater current, Clayoquot Sound, Vancouver Island, British Columbia, Canada

Shane Gross / Northern kelp crab (Pugettia producta) clinging to kelp (Laminariales), with Eelgrass (Zostera marina) in background, Prince William Sound, Alaska, USA, Pacific Ocean.

Lewis Jefferies / Diverse array of algae species including Sargassum weed (Sargassum horneri), Kelp (Laminariales), Sea lettuce (Ulva lactuca) on shallow reef with juvenile Pollock (Pollachius pollachius) and Ballan wr...

Alex Mustard / Black-lined periwinkle (Littorina compressa) on a bed of gutweed (Ulva intestinalis). St Brides Haven, Pembrokeshire, Wales, United Kingdom. British Isles. Irish Sea.

Shane Gross / Kelp humpback shrimp (Hippolyte clarki) on eelgrass (Zostera marina) off Vancouver Island, British Columbia, Canada

Philippe Clement / Gutweed / Sea lettuce (Ulva intestinalis / Enteromorpha intestinalis) green alga washed on rocky beach, Normandy, France, June

Nick Hawkins / School of juvenile Pollock (Pollachius pollachius) swimming over kelp along the Eastern Shore of Nova Scotia, Canada. July.