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...