Stock Photo - Close-up of a female St. Mark's fly (Bibio marci) resting on a leaf in a Norfolk woodland habitat in late spring. Named because it often appears close to St. Mark's day at the end of April

Stock Photo: Close-up of a female St. Mark's fly (Bibio marci) resting on a leaf in a Norfolk woodland habitat in late spring. Named because it often appears close to St.

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