Shatarr

Shatarr are a poisonous breed of lizards that live under rocks or in small caves and burrows on the planet Vulcan.

Shatarr are known for striking out at prey or intruders who pass near the entrance to their homes. Specimens can grow as large as two meters, and the larger ones have been known to attack human-sized prey. Shatarr poison is a neurotoxin that quickly attacks the victim's nervous system, causing massive muscle spasms. For the small animals that are usually its prey, death occurs within minutes. If a larger animal or Vulcan is bitten the poison requires more time to take effect, but this gives the victim an hour at most to seek treatment.

(LUG: The Way of Kolinahr: The Vulcans)