The following material is Open Game Content from the Menace Manual SRD
The minor differences between a drop bear and a koala are discernable only to trained naturalists. A drop bear can even imitate the sleepy demeanor of its genetic cousins as a sort of behavioral camouflage. Because drop bears can so easily be mistaken for koalas, roughly one-third of all fatalities from drop bear attacks occur when well-meaning tourists try to pose with the creatures for souvenir photographs.
Scent (Ex): This ability allows a drop bear to detect approaching enemies, sniff out hidden foes, and track by sense of smell.
Stealthy Pounce (Ex): If a drop bear leaps upon a flat-footed foe, it can make a full attack even if it has already taken a move action.
Drop Bear: CR 1; Medium-size animal; HD 2d8+4; hp 13; Mas 14; Init +2; Spd 30 ft., climb 20 ft.; Defense 14, touch 12, flatfooted 12 (+2 Dex, +2 natural); BAB +1; Grap +4; Atk +4 melee (1d6+4, bite); Full Atk +4 melee (1d6+4, bite) and –1 melee (1d4+2, 2 claws); FS 5 ft. by 5 ft.; Reach 5 ft.; SQ low-light vision, scent, stealthy pounce; AL none; SV Fort +5, Ref +5, Will +1; AP 0; Rep +0; Str 16, Dex 14, Con 14, Int 3, Wis 13, Cha 6.
Skills: Balance +5, Climb +6, Hide +5, Move Silently +5, Spot +3.
Advancement: 3–5 HD (Medium-size); 6–8 HD (Large).