It’s not Monday but here’s a Monday Monster anyway:
No. Enc.: 0 (1d12)
Movement: 120′ (40′)
Swim: 90′ (30′)
Armor Class: 4 
Hit Dice: 3
Attacks: 4 (2 claws, bite, tail)
Damage: 1d3 (x2), 1d6, 1d4
Hoard Class: Nil
These savage lizards grow to be up to 12′ long. They can stand and walk at 60′ (20′) on their hind legs.
UPDATE: Forgot to mention that the image is from here.