Cuckoo Condor is the boss of the Ruby Passage in Wario Land 4. Initially she's that resembles a mechanical monster vaguely resembling an old-fashioned cuckoo clock. Cuckoo Condor attacks via a claw which can be used to damage the machine by swinging it back making her hit herself.
After taking enough damage the machine is destroyed, revealing a deformed vulture-like creature that floats around laying eggs that hatch into exploding chicks. Wario defeats the bird by catching the eggs and throwing them back onto her head. Once defeated Cuckoo Condor explodes in a cloud of smoke much like the other bosses.you cant see me