Troglodyte

Troglodytes are very intelligent lizardlike humanoid creatures. They have large red eyes and spiny “combs” on their legs, head, and arms. They normally stand 5 to 6 feet tall. They can change color at will. Troglodytes secrete a smelly oil that keeps their scaly skin supple. All mammals find the scent repulsive.
Troglodytes are very hostile, attacking equal or weaker non-troglodyte groups on sight. They prefer to attack with surprise, depending on their color-changing ability for this.