S I R S , -- I am making an investigation into t h e extent t o which butterflies in t h e perfect or imaginal state are preyed upon in t h e British Isles by birds, and should be grateful for any first-hand observations, giving, where possible, t h e species of both butterfly and bird, the date and locality, whether taken a t rest or on the wing, how gripped (by wings or body), whether killed b y...

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