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While the entire Flock (save for Dylan) investigates the remains of Sydney, Australia, several of the creatures attack them while they stop by a penthouse suite for food.
Cryenas are described as being three times the size of a Great Dane, heavily muscled like a bulldog, and as having long-fanged mastiff jaws. They are furless, and their exposed skin is wrinkled and speckled with black spots; their heads are also too large for their bodies.
Also, as Fang finds out during a gruesome one-on-a dozen fight against the beasts, they are cybernetic experiments created to track down and kill the flock and other mutants ( in other words robots); although the creators didn't do a good job. The Cryenas were strong and powerful, but lacked agility and fast reflexes.