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1. Footprint fossils suggest lizards have been running on two feet for 110 million years

   Bipedal movement has existed in modern reptiles for much longer than we previously knew, writes Dr Peter Falkingham

2. Safari tourism may make elephants more aggressive – but it’s still the best tool for conservation

   Going on safari in Africa offers tourists the opportunity to see some of the most spectacular wildlife on Earth – including African elephants, but as it becomes more popular worldwide, it’s worth remembering that we often don’t know how tourism affects the animals we observe.