Bullsquid

In-game, the Bullsquid generally prefers to shoot projectiles at the player, though it will swing its tail around as a melee attack if the player gets close enough. The Bullsquid's placement in the only map they appear in d2_canals_02, suggests that the Bullsquid was meant to be placed mostly in aquatic environments, like the many canals outside City 17.
 * The Bullsquid from the original Half-Life exists in this prototype. Graphics-wise, the Bullsquid's skin is blood-red with yellow, frog-like eyes. Its underbelly is a more pink color, though.

Like in Half-Life 1, the Bullsquid will attack any Headcrabs on sight.

Its sounds are similar to the sounds the HL Bullsquid used, but with more bass on it.

The Bullsquid's projectiles have a rendering issue; the trail sprites that were meant to appear behind the projectile do not have transparency, making it look like the player is being attacked by a trail of black boxes with green and pink orbs inside them. An unused skin for a newer Bullsquid model exists in the prototype as well, but is unused. It turns out the model for this Bullsquid was meant to be used in the Half-Life 2: Episode series for a Bullsquid redesign that would behave more like a crocodile; lurking in the water and briefly attacking while out of it instead of roaming around, like it does in Half-Life and the HL2 prototype.