Hydra

Large, dragon-like creatures with multiple, serpentine heads. Sea hydras (adapted to water, with fins) also exist.

AC5 [14], HD5 to 12 (8hp per HD),
Att 5 to 12 × bite (1d10), THACO By HD (15 [+4] to 10 [+9]),
MV 120’ (40’), SV By HD,
ML 9, AL Neutral, XP 175 / 275 / 450 / 650 / 900 / 900 / 1,100 / 1,100, NA 1 (1), TT B

• Heads: 1d8+4 heads; 1HD per head.
• Disabling heads: For every 8hp damage taken, one head is disabled (cannot attack).
• Variants: Special hydras sometimes found with venom, fiery breath, etc.

Source: Classic Fantasy