Juergen Freund / Non-diver tourists surrounded by fish, trying out the sea walker from the Sunlover Pontoon, Great Barrier Reef, Queenland, Australia, November 2012

David Tipling / Grey Squirrel (Sciurus carolinensis) climbing on fence, St James Park, London, UK, October

Melvin Grey / Limpkin (Aramus guarauna) adult standing on walkway handrail. Wakodahatchee Wetlands, Florida, USA. March.

Emanuele Biggi / Cockroaches (Periplaneta australasiae) on handrail, Gomantong caves, Borneo, Sabah, Malaysia.

Bryan and Cherry Alexander / Immature Dolphin gull (Leucophaeus scoresbii) walking along the wooden handrail of a cruise ship. Ushuaia, Argentina.

Nick Garbutt / Tourist approaching White toed tarantula {Avicularia metallica} on handrail, Ecuador

Nick Garbutt / White toed tarantula {Avicularia metallica} on handrail + tourist, Ecuador,

Onne van der Wal / Handrail detail onboard 140ft luxury schooner "Skylge", designed by André Hoek and built by Holland Jachtbouw, sailing in the French Riviera, France. Property released.

Onne van der Wal / Detail of a handrail onboard 140ft luxury schooner "Skylge", designed by André Hoek and built by Holland Jachtbouw, sailing in the French Riviera, France. Property released.

Onne van der Wal / Detail of handrail onboard 140ft luxury schooner "Skylge", designed by André Hoek and built by Holland Jachtbouw, sailing in the French Riviera, France. Property released.

Mike Read / Black-headed gull (Chroicocephalus ridibundus) group on bridge handrail, Weymouth, Dorset, England, February

Philip Stephen / Red-legged kittiwake (Rissa brevirostris) perched on handrail of a fishing vessel.