Simon King follows the migrations of the osprey, while Kate Humble and Chris Packham are in Pembrokeshire seeing how the new season affects marine life.
As Part of Mars Night on BBC Four, Dr Kevin Fong charts mankind's efforts to reach and document the Red Planet.
Watch stunning clips of your favourite animals from past BBC Natural History programmes. Highlights include:
Regular updates from the BBC Natural History unit on nature and the environment. Here are some of the latest stories:
Internet technology has transformed our lives - and the BBC wants your input for a documentary marking the web's 20th birthday.
Get to know yourself by taking our personality test. Or see if you can spot a fake smile.