article_snippet.sent: However, Dr Clarke and Dr Clarke team, whose work is published in the journal BMC Evolutionary Biology, decided to focus on the softer hoo call types.
article_snippet.sent: The researchers used models like of this snake to test whether certain hoo calls were specific to predators .
article_snippet.sent: The researchers have been able to identify which of Different hoo calls are associated with particular situations.
article_snippet.sent: The researchers used a series of models of predators to test whether the calls were associated with specific predators.
article_snippet.sent: Tiger and leopard hoos were similar, suggesting that callers perceived these two predators as belonging to the same ‘big cat’ class.
article_snippet.sent: Writing in the journal BMC Evolutionary Biology, Dr Clarke and her colleagues said: 'Duet hoos tended to be higher in frequency than the other contexts, significantly so when compared with feeding,leopard, tiger and raptor hoos and raptor and tiger hoos.'