Bringing to life spectacles of natural wonder on our doorstep
Mammals are warm blooded, with hairy skin and give birth to live young which they suckle.
There are many species of mammal in the UK from the pygmy shrew, which is our smallest land mammal, through to the red deer which is in fact our largest land animal.
Ten of the spectacles in Nature's Top 40 featured mammals.
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BBC Nature's Calendar - Get top tips on how to get close to elusive Red Deer with Mike Dilger on Exmoor.
BBC Nature's Calendar - Go badger watching with Chris Packham in Dorset in broad daylight! Top Tips included.
BBC Nature's Calendar - Join Mike Dilger and David Bellamy watching Red Squirrels at Wallington in Northumberland.
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Tips for photographing mammals:
Mammals are everywhere around us... from the wide open countryside to our back gardens and yards. You may even find the odd visitor inside your house!
Off the coast in certain parts of the UK you can see dolphins, whales and seals. In some places red squirrels can be seen in woodland areas, and in urban environments foxes, hedgehogs and bats will make a home.
Pine Martens and Bottle-nose Dophins, which both feature in our Top 40, are amongst the most at risk mammals in the UK.
Chris Packham provides a guide to the mysterious art of digiscoping.
Top tips for getting out and about nature watching, from planning the trip to what to do when you get there.
Find out a bit more about some of the people whose photographs feature on the BBC Nature's Top 40 website.