The researchers hypothesized that the honeyguide responded specifically to the humans’ “brrr-hmmm” calls, and not just human voices. They tested this hypothesis by performing several different calls and monitoring which calls caused the birds to respond.
The researchers hypothesized that the honeyguide responded specifically to the humans’ “brrr-hmmm” calls, and not just human voices. They tested this hypothesis by performing several different calls and monitoring which calls caused the birds to respond.
