Ecological puzzle cottony cushion scale insects on trunk with string - Stock …
Ecological puzzle cottony cushion scale insects on trunk with string - Stock …
Ecological puzzle cottony cushion scale insects on trunk with string - Stock Image  …

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Description
A plague of scale insects on a tree trunk in autumn. The puzzle is, why is there a cluster of insects just above the string, and hardly any below? The same phenomenon occurs higher up on the same trunk, where there is another piece of tied string. London Borough of Merton, Surrey, UK.

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