
Crossing roads safely isn't a skill many animals possess.

Luckily, help is at hand in the form of innovative wildlife crossings, located at various spots across the world and in all shapes and sizes.

In Canada's Banff National Park in Alberta, for example, 24 green overpasses have been built above busy highways to help animals including bears, moose and wolves cross safely.

Over in New Zealand, an underground passage in Oamaru exists especially for penguins to get from the local harbour to their nests without encountering the traffic above.

And in Christmas Island, located close to Australia, bridges exist to help millions of crabs make it to their laying grounds every year without being flattened by cars along the way.

Here, MailOnline reveals some of the world's most inventive wildlife crossings, which help creatures as small as doormice to beasts as large as elephants.

The Blue Penguin Underpass in Oamaru, New Zealand, provides safe passage for this native species from the nearby harbour to their nests across the busy road

Every year, millions of red crabs migrate across Christmas Island to lay their eggs near the Pacific Ocean - assisted by these specially-built bridges to stop them being crushed by cars

This tunnel connects two wilderness areas in Kenya, allowing elephants to pass between them while avoiding vehicles

This wildlife ecoduct is located over a six-lane highway in Singapore and is dotted with trees and shrubs

These rope ladders have been used over Australia's Hume Highway in Victoria since 2007 to help squirrel gliders get across more easily - pictured here with some guest cockatoos

A family of common ringtail possums have also hitched a ride on the ropes, left, and a squirrel glider, right, both captured on an infrared camera

The Netherlands is home to a great number of ecoducts including this one, which help reduce the number of deer and boars being struck by vehicles

In Canada's Banff National Park in Alberta, 24 green overpasses like this one have been built over the busy highways to help animals including bears, moose and wolves cross safely

Animals' Bridge lies on the Flathead Indian Reservation in Montana, and was designed to be used by bears, deer, elk, mountain lions, and others

This netted crossing was built primarily for monkeys to make their way over a road in Bahia, Brazil

Nutty Narrows squirrel bridge is a small suspension structure which was built in 1963 above one of the main roads in Longview, Washington

This is the entrance to a tunnel for toads which runs under a six-lane highway in Davis, California, built so the amphibians can reach parts of their natural habit cut off by the road

This series of three wire walkways above a bypass in Wales was set up to protect the local doormouse population

This structure at the Capilano Fish Hatchery in Canada's North Vancouver, British Columbia, is fitted with special 'ladders' which help the fish leap upstream