From The TimeSplitters Wiki

The Deerhaunter
Unlocked by	Default
Species	Mutant
Size	Large
Accuracy	N/A
Agility	5
Stamina	5
Fire Proof	2
Shock Proof	5
Default AI	5
Native TimeZone	1994
First Appearance	TSFP Story Mode
Relations	N/A
Games	TS3

TS1 Gesture	N/A	TSFP Gesture	"The moose is loose!"
TS2 Gallery	N/A	TSFP Gallery	Go on, just try tying this guy onto the roof-rack of your sports utility vehicle.

The Deerhaunter appears in TimeSplitters: Future Perfect as a playable character. The character resembles a large deer or moose standing on its hind legs. The Deerhaunter has been stripped of its skin. Its large antlers, hooked arms and hooves make it a formidable opponent. The Deerhaunter appears in the Story mode level Mansion Of Madness as the first boss.

Glitch

There is a Mansion of Madness Boss Glitch that will make The Deerhaunter an easier fight.