Source : Webster's Revised Unabridged Dictionary (1913)

   {Laughing goose} (Zo["o]l.), the European white-fronted
      goose.

   {Laughing gull}. (Zo["o]l.)
   (a) A common European gull ({Xema ridibundus}); -- called
       also {pewit}, {black cap}, {red-legged gull}, and {sea
       crow}.
   (b) An American gull ({Larus atricilla}). In summer the head
       is nearly black, the back slate color, and the five outer
       primaries black.

   {Laughing hyena} (Zo["o]l.), the spotted hyena. See {Hyena}.
      

   {Laughing jackass} (Zo["o]l.), the great brown kingfisher
      ({Dacelo gigas}), of Australia; -- called also {giant
      kingfisher}, and {gogobera}.

   {Laughing owl} (Zo["o]l.), a peculiar owl ({Sceloglaux
      albifacies}) of New Zealand, said to be on the verge of
      extinction. The name alludes to its notes.

Wekau \We"kau\, n. (Zo["o]l.)
   A small New Zealand owl ({Sceloglaux albifacies}). It has
   short wings and long legs, and lives chiefly on the ground.

Source : WordNet®

Sceloglaux albifacies
     n : almost extinct owl of New Zealand [syn: {laughing owl}, {laughing
         jackass}]