The first 'Bird-of-Prey' seen was in TOS: 'Balance of Terror' and was of the Romulan variety. The B'rel is depicted in a size comparison chart together with other Klingon ships, the length is 110m According to the Star Trek Encyclopedia I there are two sizes of Birds-of-Prey: the smaller B'rel class ('Star Trek III', TNG: 'Rascals') and the larger K'Vort class (TNG: 'Yesterday's Enterprise').
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