#martin  any of various swallows with squarish or slightly forked tail and long pointed wings; migrate around Martinmas
  supertype:  #swallow  small long-winged songbird noted for swift graceful flight and the regularity of its migrations
  subtype:  #house_martin__housemartin__Delichon_urbica  common small European martin that builds nests under the eaves of houses
  subtype:  #bank_martin__bank_swallow__sand_martin__Riparia_riparia  swallow of the northern hemisphere that nests in tunnels dug in clay or sand banks
  subtype:  #purple_martin__Progne_subis  large North American martin of which the male is blue-black

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