This species has a number of whistled calls, but the most familiar is the contact call, cher-leeeoo.

Many social animals produce seemingly haphazard sounds which are known as contact calls.

It is usually silent but has a high-pitched alarm and contact call.

He had no reason to suspect that this was anything other than a routine contact call.

The contact call came in at about the right time.

The species' contact call has been described as a "pluit-pluit".

Its main contact call has been described as a single metallic "kej".

It has various twittering calls and a nasal contact call.

Quiet contact calls are made while feeding to facilitate cohesion with others in their social group.

She shoved a copy of the initial contact call into her machine, listened to it twice.