[1] : The Collaborative International Dictionary of English v.0.48

whitethroat \white"throat`\, n. zool.
   any one of several species of old world warblers, esp. the
   common european species sylvia cinerea, called also
   strawsmear, nettlebird, muff, and whitecap, the
   garden whitethroat, or golden warbler sylvia
   hortensis, and the lesser whitethroat sylvia curruca.
   1913 webster
see also:
sylvia cinerea strawsmear nettlebird muff whitecap garden whitethroat 
golden warbler sylvia hortensis lesser whitethroat sylvia curruca 

[2] : WordNet (r) 2.0

lesser whitethroat
     n : old world warbler similar to the greater whitethroat but
         smaller syn: whitethroat, sylvia curruca
see also:
whitethroat sylvia curruca 

Lesser >> L Words
Lesser, definition of term: Lesser
lesser_pag1.html

Whitethroat >> W Words
Whitethroat, definition of term: Whitethroat
whitethroat_pag1.html

Lesser Bear >> L Words
Lesser Bear, definition of term: Lesser Bear
lesser+bear_pag1.html