Feathered Friend (Arthur C. Clarke) — Practice

Question 1

How did Claribel save the astronauts in 'Feathered Friend'?

Accepted Answer

✦ Answer: Claribel (the canary) collapsed when oxygen levels dropped. Birds are more sensitive than humans to oxygen drops. Her collapse warned the astronauts BEFORE instruments detected the problem, giving them time to fix the air-recycling system.

Question 2

Explain the history of 'canaries in coal mines'.

Accepted Answer

Step 1 — The practice.
  For 100+ years, coal miners took canaries underground in cages.

Step 2 — Why canaries?
  Birds have very efficient respiratory systems. They are MORE SENSITIVE to oxygen deprivation and toxic gases (carbon monoxide, methane).

Step 3 — How it worked.
  If gases built up, the canary would fall silent or collapse FIRST. This gave miners EARLY WARNING to evacuate before they themselves were overcome.

Step 4 — End of practice.
  Late 20th century, electronic gas detectors replaced canaries. More humane, no animal welfare concerns.

Step 5 — Today's phrase.
  'Canary in the coal mine' = something that warns of trouble before others realise.

✦ Answer: Coal miners used canaries as EARLY WARNING for toxic gases (carbon monoxide, methane). Birds are more sensitive than humans, so their collapse warned miners to evacuate. Practice continued ~100 years until late 20th century when electronic sensors took over. The phrase 'canary in the coal mine' lives on as a metaphor for early warning.

Practice — Feathered Friend (Arthur C. Clarke)

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