ᐅ All we have observed is where moths do not spend the day. In 25 years we have found only two betularia on the tree trunks or walls adjacent to our traps (one on an appropriate background and one not), and none elsewhere – Cyril Clarke | QuotesTrue.com

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All we have observed is where moths do not spend the day. In 25 years we have found only two betularia on the tree trunks or walls adjacent to our traps (one on an appropriate background and one not), and none elsewhere

Cyril Clarke

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