What type of bird was traditionally used in coal mines?

Here is the question :

WHAT TYPE OF BIRD WAS TRADITIONALLY USED IN COAL MINES?

Here is the option for the question :

• Sparrow
• Crow
• Parrot
• Canary

The Answer:

And, the answer for the the question is :

Explanation:

[STC0018858]. Canaries have been introduced into coal mines since 1911. Scientist John Haldane suggested that they be used to detect dangerous carbon monoxide gases. Because the deadly gas has no odor, miners would have no means of identifying its presence until they became ill, or worse, killed. The birds, according to Haldane, would serve as a good warning because if one died, the miners would know to escape. Canaries were utilized in mines in the United Kingdom until 1986, when electronic detectors took their place. Despite this, the expression ‘canary in a coal mine’ is still used to describe an early warning of peril.