Reliable Toxic Detector cum Alarm

A Reliable, Available and Maintainable Toxic Detector n Alarm

Yes, this time I am mentioning about a most reliable option which could sense release (most of the releases with odour) and immediately sound an alarm!! To buy, instal and maintain, it costs very little only... it comes in two models - one with low decibal y alarm and the other with high decibal alarm. Wonder which company makes it!!
The detector is very common and often we come across in our daily..
okay.. not extending the elaboration..
It is nothing other than Chicken, oh yes, Cock (high decibel) and Hen (low decibel).

I'm serious, not joking.
I have seen a procedure describing how to use chicken (in a cage) as a detector to check the presence of hydrogen sulphide in a tunnel/man-way. Recently, also saw some pictures showing chicken (again in cage) paced in various plant locations as a detector and alarm for toxic gas releases. I've seen these being practised by leading names in the chemical process industry.
I am leaving you to guess which part of globe this could happen.

I would like to rewind to 2nd world war days.. where Russian army used the first line of defence as soldiers with ordinary guns against the heavy artillery from Hitler's side. Such a pity was the value of human during those days. Sitution have become better (or not?) for human beings, but not fellow fouls and animals.

Who knows, what all different types of exentric (or reliable!) source of detection and alarms people use in different parts of the world.