Alex Mustard / Striped mackerel (Rastrelliger kanagurta) shoal swimming with open mouths, filtering for zooplankton. Marsa Shouna, Port Ghalib, Marsa Alam, Egypt. Red Sea

Pete Oxford / Whale Shark (Rhincodon typus) filter feeding at floating fishing platform, Cenderawasih Bay, West Papua, Indonesia

Doc White / Blue Whales (Balaenoptera musculus) throat inflated, filter feeding at sea surface. California, USA. Sequence 1 of 2.

Alex Mustard / Basking shark (Cetorhinus maximus) rear view of shark feeding at the surface on plankton, Cairns Of Coll, Isle of Coll, Inner Hebrides, Scotland, UK, North East Atlantic Ocean, June

Alex Mustard / Basking shark (Cetorhinus maximus) feeding at the surface on plankton, Cairns Of Coll, Isle of Coll, Inner Hebrides, Scotland, UK, North East Atlantic Ocean, June

Norbert Wu / Whale Shark (Rhincodon typus) feeding on plankton off Isla Mujeres, Mexico

Alex Mustard / 2020VISION / Light-bulb sea squirts (Clavelina lepadiformis), a colonial filter feeding invertebrate, fluoresce green when photographed under deep blue light. Shetland Islands, Scotland, UK, June. Did you know? Se...

Alex Mustard / 2020VISION / Light-bulb sea squirts (Clavelina lepadiformis), a colonial filter feeding invertebrate, fluoresce orange when photographed under deep blue light. Shetland Islands, Scotland, UK, June. Did you know? L...

Alex Mustard / 2020VISION / Light-bulb sea squirts (Clavelina lepadiformis), a colonial filter feeding invertebrate, Shetland Islands, Scotland, UK, June

Doug Perrine / Reef manta ray (Manta alfredi formerly Manta birostris) barrel roll filter feeding on plankton, Hanifaru Bay, Baa Atoll, Maldives, Indian Ocean, October

Doug Perrine / Reef manta rays (Manta alfredi formerly Manta birostris) vortex / cyclone feeding on plankton, Hanifaru Bay, Hanifaru Lagoon, Baa Atoll, Maldives, Indian Ocean, October

Doug Perrine / Reef manta rays (Manta alfredi formerly Manta birostris) filter feeding on plankton among Silverside fish that are also feeding on the plankton, Hanifaru Bay, Hanifaru Lagoon, Baa Atoll, Maldives, Ind...

Juergen Freund / Green urn sea squirt / tunicate (Didemnum molle) internal detail. Misool, Raja Ampat, West Papua, Indonesia.

Orsolya Haarberg / Thin layer of ice viewed through a polarizing filter, Helgeland, Nordland, Norway.

Andy Rouse / Whale shark (Rhincodon typus) filter feeding, surrounded by other smaller fish, Ningaloo Reef, Western Australia

Andy Rouse / Whale shark (Rhincodon typus) filter feeding, surrounded by other smaller fish, Ningaloo Reef, Western Australia

Anup Shah / Lesser flamingo {Phoeniconaias minor} chick learning to filter-feed in water, Lake Nakuru NP, Kenya

Martin Dohrn / Mosquito {Culex pipiens} larvae filter feeding at surface of water. UK

Hiroya Minakuchi / Blue Whale (Balaenoptera musculus) filter feeding, pleated throat expands during feeding, Sea of Cortez, Mexico

Norbert Wu / Red Mangrove (Rhizophora mangle) roots create sediment filter to clear water, young trees rise up from salt water, Palau

Norbert Wu / Goose Barnacle (Lepas sp) group filter feeding, attached to fisherman's float, North Pacific

Flip Nicklin / Gray Whale (Eschrichtius robustus) bottom feeding, Vancouver Island, British Columbia, Canada

Flip Nicklin / Gray Whale (Eschrichtius robustus) filter feeding, Tofino, Vancouver Island, British Columbia, Canada

Juergen Freund / Whale shark filter feeding {Rhincodon typus} Indo-pacific

Georgette Douwma / Manta rays filter feeding at sea surface, Red Sea off Sudan

Bernard Castelein / Sun rays filter through row of Oak (Quercus robur) trees. Peerdsbos, Brasschaat, Belgium. November.

Georgette Douwma / Kaleidoscopic image of Basket star (Astroboa nuda) commonly found at night with its rays fully extended into areas of current. It removes plankton from the water column by filter feeding. During the d...

Georgette Douwma / Kaleidoscopic image of Basket star (Astroboa nuda) commonly found at night with its rays fully extended into areas of current. It removes plankton from the water column by filter feeding. During the d...

Tui De Roy / Reef manta ray (Manta alfredi) shoal filter feeding on plankton concentrated by monsoon currents in Raa Atoll, Vandhoo Thila, Maldives. October.

Magnus Lundgren / Wild Wonders of China / Pinnacle of coral and filter feedres, Xiaoliuqiu Island, Taiwan

Gary Bell/ Oceanwide / Hard Tube Coco Worm (Protula magnifica) filter feeding in Euphyllia Coral (Euphyllia ancora), Great Barrier Reef, Australia

Gary Bell/ Oceanwide / Hard Tube Coco Worm (Protula magnifica) filter feeding, Great Barrier Reef, Australia

Nick Upton / Mosquito larvae (Culicidae), filter feeding in a garden pond with the breathing tubes at the ends of their abdomens reaching the surface, Wiltshire, UK, June.

Nick Upton / Beadlet anemone (Actinia equina) with tentacles spread to catch prey in currents. Rocky shore, South Devon, England, UK. September.

Nick Upton / Strawberry anemone (Actinia fragracea) with tentacles spread, in rockpool low down on exposed rocky shore. Cornwall, England, UK. September.

Nick Upton / Strawberry anemone (Actinia fragracea) with tentacles spread, low down on exposed rocky shore. Cornwall, England, UK. September.

Ashley Cooper / Young Basking shark (Cetorhinus maximus) swimming close to shore near a couple fishing off the rocks at Porthcurno, Cornwall, UK. June 2010

Ashley Cooper / Humpback whales (Megaptera novaeangliae) feeding on Krill in Wilhelmena Bay, Antarctic Peninsula

Alex Mustard / Striped mackerel (Rastrelliger kanagurta) shoal swimming with open mouths, filtering for zooplankton. Marsa Shouna, Port Ghalib, Marsa Alam, Egypt. Red Sea

Nick Upton / Northern shoveler (Anas clypeata) large group feeding co-operatively in a shallow lake by cricling in a dense raft, believed to stir up organic sediments for them to filter feed on, Gloucestershire, U...

Nick Upton / Pair of Avocets (Recurvirostra avosetta) foraging in a shallow lake, sweeping their bills through the water to filter feed, with a Black-headed gull (Chroicocephalus ridibundus) landing on a small isl...

Nick Upton / Avocet (Recurvirostra avosetta) foraging in a shallow lake, sweeping its bill through the water to filter feed, passing a pair of Gadwall (Anas strepera), and then preening and bathing, Gloucestershir...

Nick Upton / Avocet (Recurvirostra avosetta) foraging in a shallow lake, sweeping its bill through the water to filter feed, Gloucestershire, England, UK, March.

Nick Upton / Avocet (Recurvirostra avosetta) foraging in a shallow lake, sweeping its bill through the water to filter feed, Gloucestershire, England, UK, March.

Alex Mustard / Filter feeding appendages of a Yellow california horseshoe worm (Phoronopsis californica) extending from the sand. Bitung, North Sulawesi, Indonesia. Lembeh Strait, Molucca Sea.

Floris van Breugel / Fruit fly (Drosophila melanogaster) tethered in LED illuminated chamber which stimulates moving visual patterns. Behind the fly is a camera, which is used to record its wing beat amplitude a rough me...

Pascal Kobeh / Whale shark (Rhincodon typus) mouth wide open, feeding on plankton close to the surface with snorkelers nearby, Yucatan Peninsula, Mexico

Solvin Zankl / Mosquito (Culex pipiens) larvae filter feeding at surface of water. captive, Kiel, Germany, August.

Solvin Zankl / Mosquito (Culex pipiens) larvae filter feeding at surface of water. Kiel, Germany, August.

Jordi Chias / Whale shark (Rhincodon typus) looking directly at head, Tofo beach, Mozambique, Indian Ocean

Jordi Chias / Whale shark (Rhincodon typus) mouth open feeding at night, South Ari atoll, Maldives, Indian Ocean

Jordi Chias / Reef manta (Manta alfredi) mouth open feeding at night, South Ari atoll, Maldives, Indian Ocean

Norbert Wu / Basking Shark (Cetorhinus maximus) filter feeding, Inner Hebrides, Scotland

Norbert Wu / Basking Shark (Cetorhinus maximus) filter feeding, Inner Hebrides, Scotland

Norbert Wu / Basking Shark (Cetorhinus maximus) filter feeding, Inner Hebrides, Scotland

Pete Oxford / Whale Shark (Rhincodon typus) pair filter feeding at floating fishing platform, Cenderawasih Bay, West Papua, Indonesia

Pete Oxford / Whale Shark (Rhincodon typus) pair filter feeding at floating fishing platform, Cenderawasih Bay, West Papua, Indonesia

Pete Oxford / Whale Shark (Rhincodon typus) filter feeding at floating fishing platform, Cenderawasih Bay, West Papua, Indonesia

Pete Oxford / Whale Shark (Rhincodon typus) pair filter feeding at floating fishing platform, Cenderawasih Bay, West Papua, Indonesia

Pete Oxford / Whale Shark (Rhincodon typus) filter feeding at floating fishing platform, Cenderawasih Bay, West Papua, Indonesia

Pete Oxford / Whale Shark (Rhincodon typus) pair filter feeding at floating fishing platform, Cenderawasih Bay, West Papua, Indonesia

Pete Oxford / Whale Shark (Rhincodon typus) filter feeding, Cenderawasih Bay, West Papua, Indonesia

Pete Oxford / Whale Shark (Rhincodon typus) filter feeding at surface, Cenderawasih Bay, West Papua, Indonesia

Pete Oxford / Whale Shark (Rhincodon typus) pair filter feeding at surface, Cenderawasih Bay, West Papua, Indonesia

Pete Oxford / Whale Shark (Rhincodon typus) filter feeding at floating fishing platform, Cenderawasih Bay, West Papua, Indonesia

Pete Oxford / Whale Shark (Rhincodon typus) pair filter feeding at floating fishing platform, Cenderawasih Bay, West Papua, Indonesia

Pete Oxford / Whale Shark (Rhincodon typus) pair filter feeding at floating fishing platform, Cenderawasih Bay, West Papua, Indonesia

Pete Oxford / Whale Shark (Rhincodon typus) filter feeding, Cenderawasih Bay, West Papua, Indonesia

Pete Oxford / Whale Shark (Rhincodon typus) filter feeding near tourist, Cenderawasih Bay, West Papua, Indonesia

Alex Mustard / High magnification detail of filter feeding appendage of Christmas tree worm (Spirobranchus giganteus) Misool, Raja Ampat, West Papua, Indonesia. Ceram Sea, Tropical West Pacific Ocean.

Fred Bavendam / Reef Manta Ray (Manta alfredi) feeding on plankton, Nusa Penida, Indonesia

Nick Upton / Keelworm (Pomatoceros lamarcki) with filter feeding tentacles visible at the mouth of its tube, attached to boulder in a rockpool, Lyme Regis, Dorset, UK, May.

Alex Mustard / Hooded nudibranchs (Melibe leonina) filter feeding beneath bull kelp. Hussar Point, Browning Pass, Port Hardy, Vancouver Island, British Columbia, Canada.

Michael Pitts / Sand lizard fish (Synodus dermatogenys) taken at night with fluorescent light and yellow filter. Maldives.

Andy Trowbridge / River ice formed on top of river boulders in the shape of lily pads. Hoar frost from surrounding trees has fallen onto the ice. Tangenelven River, Norway, January. (Taken with Blue'n'Gold polarising f...

Doc White / Blue Whale (Balaenoptera musculus) throat inflated, filter feeding at sea surface. California, USA.

Alex Mustard / Whale shark (Rhincodon typus) mouth open filter feeding at the surface, Quintana Roo, Yucatan Peninsular, Mexico, Caribbean Sea.

Alex Mustard / A snorkeller films himself swimming with a filter feeding Whale shark (Rhincodon typus), Isla Mujeres, Quintana Roo, Yucatan Peninsula, Mexico, Caribbean Sea.

Norbert Wu / Mangrove (Rhizophoraceae) and Eelgrass (Zostera sp) filter out sediment, Bahamas, Caribbean

Norbert Wu / Mangrove (Rhizophoraceae) and Eelgrass (Zostera sp) filter out sediment, Bahamas, Caribbean

Marie Read / Northern Shoveler (Anas clypeata) male feeding by dabbling as it walks through shallow water, using its bill as a sieve. Orange County, California, April.

Richard Herrmann / Whale Shark (Rhincodon typus) feeding on plankton, Isla Mujeres, Quintana Roo, Yucatan, Mexico

Alex Mustard / Basking shark (Cetorhinus maximus) feeding at the surface on plankton, Cairns Of Coll, Isle of Coll, Inner Hebrides, Scotland, UK, North East Atlantic Ocean, June

Alex Mustard / Basking shark (Cetorhinus maximus) feeding at the surface on plankton, Cairns Of Coll, Isle of Coll, Inner Hebrides, Scotland, UK, North East Atlantic Ocean, June

Alex Mustard / Basking shark (Cetorhinus maximus) feeding at the surface on plankton. Note the sea lampreys beneath the tail (Petromyzon marinus) Cairns Of Coll, Isle of Coll, Inner Hebrides, Scotland, UK, North Eas...

Alex Mustard / Whale shark (Rhincodon typus) feeding on fish eggs (not visible) just below the surface in calm weather. Isla Mujeres, Quintana Roo, Yucatan Peninsular, Mexico, Caribbean Sea.

Alex Mustard / Whale shark (Rhincodon typus) feeding on fish eggs (not visible) just below the surface in calm weather. Isla Mujeres, Quintana Roo, Yucatan Peninsular, Mexico, Caribbean Sea.

Alex Mustard / Whale sharks (Rhincodon typus) pair feeding at the surface, Isla Mujeres, Quintana Roo, Yucatan Peninsular, Mexico, Caribbean Sea.

Charlie Summers / Greater flamingo (Phoenicopterus roseus) filter feeding in Lake Ndutu, Serengeti National Park side, Tanzania, East Africa February.

Charlie Summers / Greater flamingo (Phoenicopterus roseus) filter feeding in Lake Ndutu, Serengeti National Park side, Tanzania, East Africa February.

Nick Upton / Snakelocks anemone (Anemonia viridis) filter feeding in a rockpool, with closed Beadlet anemone (Actinia equina) in the background. Rhossili, The Gower Peninsula, July.

Alex Mustard / 2020VISION / Basking shark (Cetorhinus maximus) filter feeding in plankton rich waters around the Island of Coll, Inner Hebrides, Scotland, June.

Alex Mustard / 2020VISION / Basking shark (Cetorhinus maximus) filter feeding in plankton rich waters around the Island of Coll, Inner Hebrides, Scotland, June.

Nick Upton / Variegated scallop (Chlamys varia) filter feeding with its valves partly open while attached to a boulder in a rockpool low on the shore, with a Common limpet (Patella vulgata) in the background, near...

Sue Daly / Tube worm / Double sprial worm (Bispira volutacornis) Channel Islands, UK June

Sue Daly / Jewel sea anemones (Corynactis viridis) Channel Islands, UK May