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In S31novel: Disavowed, the Silwaan were referred to as "Silgov", purportedly as a typographical error, and not in relation to the Silgovrace from Star Trek: Vanguard. For the purposes of this wiki that reference is included in this article, despite the difference in name.
As members of the Breen Confederacy, Silwaan wore the equalizing bodysuit, completely obscuring their physiology except for the fact that they were humanoid. However, movement and gait could give them away to somebody with experience with various Breen species. In 2386, Federation Breen specialist DoctorJulian Bashir recognized ThotTrom's species through his gait. (S31novel: Disavowed)