Definition: Given the Question and Answer pair, detect whether the answer is acceptable or not. Denote acceptable answer as "yes", otherwise denote as "no". An acceptable answer is consistent with the context in question, detailed, long, and uses general knowledge of English. Answers that are not definite and suggest a variety of options are not acceptable answers.
Input: Question: I've found that expression on a website, and I don't understand it. At first I thought it was because the canary is yellow and the coal black... but it doesn't make much sense. 
Answer: Miners used canaries to detect carbon monoxide and other gases in the mines. As long as the canaries continued to sing, the miners were safe. If the canary died, they'd evacuate the miners. I didn't see a reference included in your posting so lacking the context of the quote, I'd go out on a limb to say that what is meant is either literally a reference to that practice of gas detection or it is some sort of metaphor for some sort of early warning system as in the example below. An example of how this expression can be used metaphorically, from wisegeek.com: "Today, the practice of using a bird to test the air supply has become part of coal mining lore, but the ideology behind it has become a popular expression. The phrase "living like a canary in a coal mine" often refers to serving as a warning to others. The actual canary had little control over its fate, but it continued to sing anyway. In one sense, living this way indicates a willingness to experience life's dangers without compromise.".

no