Bull





Bulls are located in sand traps found in Maridia as well as in parts of the Wrecked Ship. Their appearance is extremely similar to the Puffers and Preeds of the Metroid Prime Trilogy; instead of expelling gas, however, they are covered in eyestalks. Their only attack is a quick ram, but they can easily home in on their targets. Their durable armor allows them to survive attacks from most weaponry, but a Super Missile, the Grappling Beam, a few Power Bombs or Plasma Beam shots will kill these creatures.

An untold number of Bulls were captured and brought to the Biologic Space Laboratories research station in Metroid Fusion, where they would later become X Parasite hosts. Bull-X no longer attempt to ram their opponents and instead float around aimlessly. They will expel toxic gas from their orifices whenever they are attacked (much like the Puffers and Preeds from the Prime games). Bull-X also have strange coloring which matches their new toxic trait.

Bulls appear in Metroid: Other M in their first official 3D appearance. They appear to have a blue color scheme and expel gas, similar to Fusion, their look in the Main Sector and the Biosphere. They also appear in the fire area, the Pyrosphere, with a considerably more red appearance and the ability to expel fire. These Bulls are non-aggressive, although they will detonate in a cloud of toxic gas if shot or touched.

Super Metroid refers to them in internal code as a "Pipe". 

Heat Bull
A Heat Bull is a firey version of the Bull that appears in Metroid: Other M. Instead of exploding with a poison cloud, it has a much more violent flaming explosion. Its tubes can be frozen over by the Ice Beam, rendering it harmless until it decides to blow itself up.

Super Metroid Nintendo Player's Guide
"They charge directly at you."

Trivia

 * Their name may be derived from their similar behavior to a real-life bull (in the ramming aspect).
 * The Bull graphics in Super Metroid seem to have been reused for Metroid Fusion.

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