EDIT: Revised to MM3 standards (and dire bunyip added)
here.
BUNYIP--- Level 3 Skirmisher
Medium natural beast (aquatic)--- XP 150
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Initiative +5; Senses Perception +3, low-light vision
HP 47; Bloodied 23
AC 17; Fortitude 17; Reflex 15; Will 15
Speed 6, swim 6
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[Melee basic] Bite (standard; at will): +8 vs. AC; 1d10+3 damage (1d10+8 if target is in the water and does not have the aquatic keyword).
[Melee] Underwater Attack (standard; recharge 4 5 6): Only against a creature without the aquatic keyword that is in the water. The bunyip swims 4 squares underwater and attacks: +10 vs. AC; 1d10+3 damage and target slides 2 squares.
[Close] Roar (standard; recharges when first bloodied)
Fear, Thunder: Close burst 6; attacks living enemies; +4 vs. Will; Hit: target is dazed (save ends); Miss: target suffers -1 on attack rolls until the end of its next turn.
Underwater Escape (immediate interrupt; when a creature without the aquatic keyword that is in the water hits the bunyip with a melee, close or area attack; encounter): The bunyip ducks under the water and gains Resist 5 against the triggering attack.
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Alignment unaligned; Languages Bunyip
Skills Athletics +10, Stealth +8
Str 18; Dex 15; Wis 15
Con 15; Int 6; Cha 13
GIANT BUNYIP--- Level 15 Brute
Large natural beast (aquatic)--- XP 1200
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Initiative +12; Senses Perception +12, low-light vision
HP 175; Bloodied 87
AC 27; Fortitude 29; Reflex 27; Will 27
Speed 6, swim 6
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[Melee basic] Savage Bite (standard; at will): +18 vs. AC; 2d8+6 damage (2d8+11 if target is in the water and does not have the aquatic keyword).
[Close] Roar (standard; recharges when first bloodied)
Fear, Thunder: Close burst 6; attacks living enemies; +14 vs. Will; Hit: target is dazed (save ends); Miss: target suffers -1 on attack rolls until the end of its next turn.
Underwater Escape (immediate interrupt; when a creature without the aquatic keyword that is in the water hits the bunyip with a melee, close or area attack; recharges when first bloodied): The bunyip ducks under the water and gains Resist 10 against the triggering attack.
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Alignment unaligned; Languages Bunyip
Skills Athletics +19, Stealth +12
Str 25; Dex 20; Wis 20
Con 15; Int 9; Cha 18