These ships served in the Klingon Empire at one time or another
Bird of Prey Class -
Maveq Class Bird of Prey (Corvette)
D-12 Class Bird of Prey- http://worldofjaymz.wikia.com/wiki/D-12_Bird_of_Prey
D-13 Class Bird of Prey - http://worldofjaymz.wikia.com/wiki/D-13_Bird_of_Prey
B'rel Class Bird of Prey - http://worldofjaymz.wikia.com/wiki/B%27rel_Class_Bird_of_Prey
K'vort Class Bird of Prey - http://worldofjaymz.wikia.com/wiki/K%27vort_class_Bird_of_Prey