When it comes to the alarm failure and the canary in "Feathered Friend," we can answer the questions in the following manner:
In the story, Sven brings a canary with him to the space station. He wants to see the effects of low gravity on the bird. However, the bird ends up saving everyone's lives.
Sven notices the bird has fainted, and he has knowledge of canaries being used in mines to alert workers about the quality of the air. He quickly assumes there is not enough oxygen.
It turns out that their electronic alarm failed to go off for some reason. Had Sven not brought the bird with him, the crew would have died due to lack of oxygen.
Learn more about canaries here:
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