Yawn

    The Yawn was a snake-based B.O.W. that lurked around in the Arklay mansion.

In early 1998, the Yawn was one of many test subjects bred specifically as experimental B.O.W.s.. The specimen escaped however, and managed to avoid recapture by the scientists in the Arklay Laboratory. It was eventually infected with the t-virus following the leak in May, 1998, and it promptly made the mansion its home, preying on any humans that happened to come across it.

The Yawn encountered S.T.A.R.S. Bravo team members Richard Aiken and Rebecca Chambers as they explored the mansion, hunting them through individual rooms until it cornered them. After Richard managed to save Rebecca from harm, the Yawn attacked and bit into Richard before escaping back into the Mansion's framework. Bleeding and injected with a large dose with venom, Richard and Rebecca hid until they were discovered by S.T.A.R.S. Alpha Team members Chris Redfield and Jill Valentine.

The Yawn was later fought in the attic, but escaped through a fireplace before it could be killed. The Yawn would later attack one of the S.T.A.R.S. Alpha team members in the library, where it was finally killed.

From the accomplished research, the specimen proved that Snake-based B.O.W.s were unfit for production. The specimen earned the nickname "Yawn" as it gave the appearance of yawning as it opened its mouth to attack its prey. The most noticeable aspect of its t-virus infection was its enormous size, large enough to swallow a human being whole. It also proved to retain its predator intellect, easily able to stalk and attack its prey before they even realized it. However, the Yawn exhibited examples of uncoordinated mutations, as its size became greatly inconsistent with its length, and its body became covered with various sores and tumors. The potency of its venom was also significantly enhanced, requiring a specially-formulated serum to counteract it. Its venom could quickly immobilize a human being in minutes, and would kill the victim shortly afterward if left untreated.