Lakelurk

Lakelurks are creatures found in the Mojave Wasteland in 2281.

Biology
Lakelurks are mutant snapping turtles who live around bodies of water and survive in the pure water that flows through. Places like Lake Mead, the Colorado River, the Camp Guardian caves, Blue Paradise Vacation Rentals and Ruby Hill mine are prime locations to find these reptilians.

They are fiercely territorial and aggressive, attacking anyone or anything that comes near, and are usually found in groups of two to three. Lakelurks have two sets of teeth; a set similar to human teeth and another set of teeth in front similar to that of a piranha.

The fact that lakelurks generally keep together in groups of three to four and they have a high perception make them very quick to find potential prey. Once found they are capable of emitting long-distance sonic pulse waves to stun and confuse their enemies before swiping at the prey with their claws.

Lakelurks are similar to the mirelurk kings of Capital Wasteland, but unlike their cousins, they do not have any form of symbiosis with a mutant crab species.

Gameplay attributes
Strangely, if they follow the player into water, they will have no underwater attacks and only glare at them. But if their sonic attack is fired from land, it will go straight through water as it does through the air, putting the player at a disadvantage of not being able to attack back. It is generally best to pick them off from a distance as they tend to swarm the player if at close range.

Interestingly, their bodies don't float when killed in water, they will sink. However, their guts will sometimes float in water if you make the body "explode" with the Bloody Mess perk, making you able to stand on them and "walk" on the water.

Before attacking lakelurks will roar at the player, giving them a short amount of time to attack the lakelurk without it fighting back.

Lakelurk
The standard lakelurk with all characteristics mentioned above.

Lakelurk king
The lakelurk king is a stronger form of the lakelurk. While visually similar, the king has slightly glowing eyes, fins, claws, and other protrusions. Also of note is the apparent use of body 'paint' on its chest, (suggesting it may have some form of intelligence, or it may be just skin pigment). It can be found in Camp Guardian caves in a large room among multiple lakelurk egg clutches. Killing it will cause the other lakelurks in the cave to frenzy and become hostile towards each other.

Alpha male lakelurk
The alpha male lakelurk was a subspecies of lakelurk that was to appear in Fallout: New Vegas, but was cut from the game prior to release. It is a stronger form of the lakelurk that is visually identical to the lakelurk king.

Appearances
Lakelurks appear only in Fallout: New Vegas.

Behind the scenes

 * The lakelurk reuses the mirelurk king model from Fallout 3, which appears to be modeled on the monster from the 1954 film Creature From the Black Lagoon, although apart from looks and generally hostile behavior, they share no other similarities.