Gorillas are well known for beating their chests when they are 0 _____, but it seems they also have a gentler and more 17 side to their character. A new study has shown that gorillas ‘sing’ 18 while they are eating. A group of 19 who studied the animals in the wild found that they make a range of different 20 sounds, especially when eating their favourite foods. And different gorillas have their own favourite ‘tunes’. The sounds may show their 21 in what they are eating, but they may also be used as a form of 22 . The larger, male gorillas are the ones who make all the 23 for the group. The ‘singing’ may be their way of saying that it is time to sit down and eat. This is perhaps the most 24 discovery, as it might shed light on how human language evolved.