Chemical messages | Cat Watch 2014: The New Horizon Experiment
Cats leave chemical messages to other cats, which can be picked up with their exceptional sense of smell, which help them to attract mates.Tweet
How fossils and living animals provide links between animal groups | Charles Darwin and the Tree of Life
Passionate Darwinian David Attenborough looks at the evidence for evolution provided by fossils and living species which show the links between different animal groups.
Human impact | Highlands - Scotland's Wild Heart
The impact of human life on marine seabirds is quite apparent as the seas warm. This has encouraged different types of fish as food and some contain less nutrients needed for their survival.