Breen

The Breen are a technologically advance race that either live in the Alpha or Beta Quadrants of the galaxy.  The Breen are a humanoid race, and stand about the same height as humans.  They have been called a warrior race.  The Breen come from a planet of the same name, which has a polar environment.  Kira once described the planet Breen as a "frozen ball of ice."  As a result of their frigid homeworld, the Breen require heavy survival suits to survive in hot climates.  At room temperature, they seem to get along fine wearing thinner uniforms, along with a beaklike helmet that covers their face.  Whether ornot this equipment is also essential for a Breen's survival remains to be seen.  Breen brains are four-lobed, as are Ferengi and Dopterian brains.  This makes them unreadable by Betazoids.  Another interesting part of Breen physiology is that they have no blood.  Pregnancy at a young age is not uncommon amongst the Breen.  

The Breen utilize biological components in much of their technology, including their ships.  They are also the manufacturers of the CRM-114, an extremely powerful portable hand cannon designed to destroy moving targets and surface emplacements, marketed by Quark's cousin Gaila.  The Breen use disrupters as their primary weapons.  They are classified as type 3 (the same type as Klingons and Romulan disrupters), and discharge blue pulses.  Breen starships also utilize disrupters, although some use phasers.  Breen starships also have cloaking devices.  Due to their environment, the Breen are experts at refrigeration.