They will spit acid at the player, which can also leave acidic puddles on the ground that can still damage players and vehicles, as well as slow them both down and leave a brief acidic, damaging effect for a few seconds. Unlike other enemies, they are also highly resistant to fire. They rely on high damage, great range and splash damage to keep the player away from the worms and the nests they protect, but either one of these advantages can be overcome. They act like static turrets and will not follow attackers. The Worms are natural allies of biters and spitters and will attack the player if they get close enough with an attack similar to spitters'.

The bulkiest of the spitters and so can take even more damage. Their behaviour and size classification are the same as with biters, but their health is universally lower and they are resistant exclusively against explosives, with no physical resistance. Most entities of the game have a much lower resistance to acid than other damage types (including turrets and armor), so spitters are effectively more potent against the player and their factories. Both the stream and the puddle of acid deal damage of time and slow down players and vehicles. Due to the spitters' predictive aiming, the acid stream can be dodged by suddenly changing walking directions or standing still. Using predictive aiming, they spit a stream of acid at enemies which leaves behind a puddle of acid where it hits the ground. Their main difference from biters is their ranged attack.

Spitters are much like biters and only appear slightly later on in the game as the evolution factor increases. Can attack through walls, hitting objects directly behind them. Extremely durable and nearly immune to small arms, except for the strongest ordnance.

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