 Many <unk> moths make clicks when hunted by echolocating bats ; they also often contain unpalatable chemicals . Some such as <unk> tiger moths ( <unk> <unk> ) have ears and conspicuous coloration , and start to make clicks when echolocating bats approach . An experiment by Canadian zoologists John M. Ratcliffe and James H. <unk> , using <unk> tiger moths and northern long @-@ eared bats ( Myotis septentrionalis ) , suggests the signals in fact both disrupt echolocation and warn of chemical defence . The behaviour of these insects is thus both deimatic and aposematic . 
