Duck the question

Sir, – Helen Fanning (Letters, April 14th) wonders why a duckling can be pure yellow, while its siblings are yellow and brown.

Apparently, it’s all down to genetics; they could be eider colour. – Yours, etc,

PAUL DELANEY,

Dalkey,

Zoo ready?

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AstraZeneca – much caution, little risk?

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Mandatory hotel quarantine is excessive

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Voting and external influence

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Co Dublin.