canary

And what if they're only the canary in the coal mine for doctors and MBAs and government workers?

In the middle is a long in-drawn note, much like one of the canary's.

Still, the manager himself hadn't really cared about the Twinklers since the canary came.

There is also every probability that the Canary islands and Madeira were entirely in their possession.

From one subject he leaps to another like a canary hopping on the sticks of his cage; but there is method in his madness.

He had plenty of ale and cider, with which the Cavaliers were perfectly content, but only a single runlet of canary.