Alien birds have a blue eye in between two pieces of metal. These pieces of metal are grey at the front with a yellow line behind the grey part and pink towards the end.
Alien birds fly in groups of four in a formation of a plus sign (+), the birds being at the end of the plus sign. They fly in a zig-zag motion, even through walls and enemies.They have no special attack, and will explode when they touch Canary 214-LE. While moving, they move their winglike beak up and down periodically. They appear less times as opposed to any other enemy.
The alien bird may be a type of alien bat, judging from their similar appearance to them.
The beaks of the bird are coloured in warning stripes, suggesting the birds are actually alien larvas with the ability to fly and pieces of metal as beaks.
The appearance of the alien bird is likely based off of Shriekbats from the Metroid series.
Their behavior bears similarities to Wavers, also from the Metroid series.