Juergen Freund / Bivalve mollusc lives in crevices in colonies of living hard corals. Only the the shell opening and mantle are visible, along with the minute eyes along its margin, West New Britain, Papua New Guinea.

Juergen Freund / Cyanide fisherman applying cyanide to coral crevices to stun fish. This is highly damaging fishing practice to catch live reef fish either for the aquarium or food fish trade. Palawan, Philippines, Ap...

Charlie Summers / Cape Golden Cobra (Naja nivea) foraging for potential prey in the cracks and crevices of an Acacia tree, Kgalagadi TB Park of South Africa, May

Georgette Douwma / 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 day it hides under coral...

Georgette Douwma / 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 day it hides under coral...

Georgette Douwma / 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 day it hides under coral...

Georgette Douwma / 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 day it hides under coral...

Inaki Relanzon / Fig tree (Ficus sp) branches growing in rock crevices, Isalo National Park, South Madagascar

Nick Garbutt / English Stonecrop (Sedum anglicum) growing in rock crevices on the shoreline. Coast of Isle of Mull, Scotland, UK.

Nick Garbutt / English Stonecrop (Sedum anglicum) growing in rock crevices on the shoreline. Coast of Isle of Mull, Scotland, UK.

Oriol Alamany / Alpine wildflowers in the rock crevices of Hausberg Col (4591 m), below Mount Kenya, Mount Kenya National Park, Kenya

Yva Momatiuk & John Eastcott / Iceberg with dark blue lines created by water which entered glacial crevices and froze there, western Antarctica

Norbert Wu / Longnose Butterflyfish (Forcipiger flavissimus) long nose helps it feed in crevices, Hawaii

Norbert Wu / Horn Shark (Heterodontus francisci) hard egg case is screwed into rock crevices

Nick Upton / A small red alga (Catenella caespitosa) growing in crevices in limestone rocks high on the shoreline, exposed at low tide. Rhossili, The Gower Peninsula, UK, July.

Nick Upton / A small red alga (Catenella caespitosa) growing in crevices in limestone rocks high on the shoreline, exposed at low tide. Rhossili, The Gower Peninsula, UK, July.

Onne van der Wal / A glacier fills in rock crevices in the Chilean waterway.

Roberto Rinaldi / Person walking between crevices on the Perito Moreno glacier, Los Glaciares National Park, Patagonia, Argentina