Conkdors are large bird enemies that debuted in Super Mario 3D World. They stand on the ground and attack by slamming their heads forward when a player character crosses their path. They have no visible wings and typically occur in desert-themed areas. Conkdors look somewhat similar to male ostriches, with long featherless necks, white ruffs, and dark blue bodies. They wear magenta glasses, their beaks are yellow with brown tips, and their backs are protected by spiked, magenta-colored Spiny-like shells.

Source: https://www.mariowiki.com/Conkdor