The roar of an African lion is one of the most iconic sounds of the animal kingdom.

However, my new research suggests it should actually be separated into two distinct vocalisations: the full-throated roar, and an "intermediary roar" with a flatter, less varied sound. Making this distinction could have important implications for lions' conservation.

The total population of wild lions in Africa is estimated to be between 22,000 and 25,000, but this number is half what it was 25 years ago . The main drivers of this decline are habitat loss and fragmentation, reduction in prey, and conflict with local people.

According to the International Union for Conservation of Nature red list, lions are now vulnerable to extinction .

My colleagues and I investigated roaring in lions to get bett

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