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

Philippe Clement / Photovoltaic solar panels on roof of house inside incandescent lamp / bulb against black background Digital composite

Philippe Clement / Sunflowers (Helianthus annuus) inside incandescent lamp / bulb against white background Digital composite

Sue Daly / Lightbulb seasquirts / tunicates (Clavelina lepadiformis) cluster on rock, Channel Isles, UK, July

Stephen Dalton / Swallow (Hirundo rustica) feeding chicks on nest build over light bulb, England, UK

SCOTLAND: The Big Picture / Curled octopus (Eledone cirrhosa) amongst a mearl bed, with Lightbulb tunicates (Clavelina lepadiformis) Shetland, Scotland, UK, August.

Ashley Cooper / Old man with a low energy light bulb which he can use to power house with solar charged batteries from WWF project to supply electricity to a remote island in the Sunderbans, Ganges Delta, India. Dece...

Sue Daly / Lightbulb sea squirt (Clavelina lepadiformis) Trondheimsfjord, Norway, July.

Andy Jackson / 2020VISION / Light bulb sea squirt (Clavelina lepadiformis), Endeavour Wreck, Kirkwall, Orkney, Scotland, UK, July.

Enrique Lopez-Tapia / Ants preying on beetle; these ants wait on light bulb to catch insects attracted to the light, Royal Chitwan National Park, Nepal.