They have a few movesets but one that is particularly dangerous:
When fighting the creature on land, the player should aim for its mouth as it deals more damage compared to shooting its body. The creature momentarily exposes its weakness when it moves, giving the player a short time to shoot it,
Underwater, the creature becomes a threat as they can instantly kill the player, coupled with inability to use firearms underwater. The player isn't entirely helpess however, as they can use a Pulse Grenade to stun them for an amount of time.
"An ugly chunk of meat from the beach."
— Description in Raid Mode Missions