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...universally. Non-mammals can generate body heat, for example a python and some species of fish, such as tuna. A reptile basking in the sun can become as warm to the touch as a mammal and its lethal temperature may be higher than that of many mammals. If you’ve encountered a mammal during hibernation – perhaps a cautious investigation of a hedgehog – you’ll...

...guide to how temperatures averaged across the whole hemisphere changed during the course of the last 1000 years. Like the instrumental record (shown in red), the proxy record includes annual data and a smoothed curve that brings out variability on a time-scale of several decades. The grey region is the 95% confidence range in the annual data. Note that the uncertainty is...

...university types perhaps, and I believe that these programmes were shown on university syllabuses, if that’s a word. So hopefully that did influence people and that was a long time ago, it was like 25, 30 years’ ago, so since that time through all the other landmark series, that’s probably had the most impact. It had the advantage too of course of having animals...

...University of Cambridge degree in natural science. He has been producing and presenting natural history programmes for the BBC since the 1950s, when he made his first series Zoo Quest. The programme he is most proud of and best known for is the landmark series Life on Earth, which he wrote and presented, and which was first broadcast on the BBC in 1979. Since then he has...