Olga Kamenskaya / Great spider crab (Hyas araneus) Novaya Zemlya, Russian Arctic, July

Olga Kamenskaya / Great spider crab (Hyas araneus) Novaya Zemlya, Russian Arctic, July

Olga Kamenskaya / Great spider crab (Hyas araneus) Novaya Zemlya, Russian Arctic, July

Olga Kamenskaya / Great spider crab (Hyas araneus) Svalbard, Norway, September.

Nick Upton / Common prawns (Palaemon serratus) and a Shanny (Lipophrys pholis) feeding on a dead Montagu's crab (Xantho hydrophilus) in a rockpool, Cornwall, England, UK, September.

Nick Upton / Common prawns (Palaemon serratus) feeding on a dead Montagu's crab (Xantho hydrophilus) in a rockpool, with a a Rock goby (Gobius paganellus) swimming past, Cornwall, England, UK, September.

Jack Perks / European spider crab (Hyas araneus) entering frame, stopping to feed on seabed before walking off into Common eelgrass (Zostera marina), Swanage pier, Dorset, England, UK, English Channel, September.

Emanuele Biggi / Freshwater crab (Potamon fluviatile) feeding on newly hatched Common toad (Bufo bufo) tadpoles at night, Tolfa, Rome, Italy.

Alex Mustard / Great spider crab (Hyas araneus) attacking the camera, amongst a bed of Common brittlestar (Ophiothrix fragilis) and Deadman's fingers (Alcyonium digitatum), Loch Carron, Highlands, Scotland, UK.

Alex Mustard / RF - Great spider crab (Hyas araneus) clinging to a blade of Kelp (Laminaria hyperborea) billowing in the current. Loch Carron, Scotland, UK. (This image may be licensed either as rights managed or ro...

Alex Mustard / Large Great spider crab (Hyas araneus) clambers over a seabed covered in colourful Common brittlestars (Ophiothrix fragilis). Fort William, Lochaber, The Highlands, Scotland, United Kingdom. Loch Linn...

Alex Mustard / Great spider crab (Hyas araneus) covered in algae, climbing up onto a frond of kelp (Laminaria hyperborea). Lochcarron, Ross-shire, Ross and Cromarty, Highlands, Scotland, United Kingdom. British Isle...