A Long-Tongued Tachinid Fly (Senostoma species, approximately 12 mm (0.5 in) in length), feeding on nectar. This is one of the 240,000 known species of true flies, which are distinguished by a single pair of wings on the mesothorax and a pair of halteres, derived from the hind wings, on the metathorax.Photo credit: Fir0002