Squidcadas can be held with both hands to significantly increase Slugcat's jump height and distance. However, Squidcadas grow exhausted with continued movement and need to stop flying to rest. When this happens, Slugcat must stay still in order for them to wake up. Squidcadas wake faster if released. Black Squidcadas have less stamina, making White Squidcadas a better choice for crossing large gaps.

Their behavior towards Slugcat is generally harmless, though they may attempt to headbutt. When they do this, the Squidcada pauses midair, flutters their wings, and darts in a straight line toward wherever they were aiming. This behavior is not lethal in and of itself, but can be an annoyance or knock Slugcat into dangerous situations.

Squidcadas hunt Batflies, Leeches, and Infant Centipedes. They catch Leeches by diving into the water and trying to grab a single Leech. This can sometimes result in multiple Leeches latching onto a Squidcada, causing them to drown. They may also catch Leeches that are attached to another creature.

Squidcadas can eat Infant Noodleflies if one is given to them by Slugcat, but they do not actively hunt them.

Adult Noodleflies are frail and can be killed in a single Spear hit. However, they are fierce and agile, making up for their low health with high mobility, which makes it difficult to hit them from a distance. They utilize two attacks in combat: the poke, a quick, close-range, temporarily-stunning jab, and the stab, a lethal, long-range lunge with a well-telegraphed wind-up. If dodged, the stab can lodge the Noodlefly into a wall or floor, trapping them for around 3-4 seconds and leaving them vulnerable to attack. Making contact with the tip of the needle may stun Slugcat and cause them to drop held objects.

Hiding in pipes or tunnels is an effective evasion strategy, as Adult Noodleflies are unable to attack while in one. They may still try to attack from outside one, however. Alternatively, the player may attempt to get very close (practically touching them), as doing so makes the Noodlefly unable to attack, and may even cause them to fully retract the needle for a short amount of time.

Adult Noodleflies can swiftly dodge thrown objects such as Spears and Rocks. This has a very short cooldown, rendering them near impossible to hit in flight.

If an Adult Noodlefly perceives another creature as a threat to them or their offspring, they become aggressive and begin hunting down the offending creature. Holding a Noodlefly Egg aggravates Adult Noodleflies until the Noodlefly Egg is dropped.

Within the game's code, a value called tempLike determines a creature's relationship with an Adult Noodlefly. This number slowly increases over time, but certain actions lower it. If it falls below -0.25, the Adult Noodlefly becomes hostile until the value rises back above this threshold. Being the closest to an injured Infant Noodlefly instantly sets this value to -1, the lowest possible, meaning an Adult Noodlefly can often stay aggravated for an entire cycle if they were angered this way. Attempting to throw weapons at a Noodlefly or hitting them with a Rock also decreases this value. In practice, this means that missing 50 throws with Rocks, 12 throws with a Spear, or hitting one 16 times with a Rock turns them hostile for a short period of time.

A single Spear hit is enough to kill a Dropwig. If room geometry permits, a Dropwig may be killed with little risk by throwing a Spear at their perch on the ceiling. Otherwise, Sliding or backflipping can be used to bait out their drop attack, giving an opportunity to immediately retaliate with a Spear.

Dropwigs only attack by ambushing and are reliant on their line of sight directly underneath them. Because of this, stealth is quite effective against them as long as extra care is taken to watch for them on ceilings. Unusually placed objects, such as a Blue Fruit on the ground, can indicate a Dropwig perched above. Once located, the simplest course of action is to find an alternative path around them; if their line of sight is not crossed, they do not attack. In cases where avoiding their line of sight is impossible, other methods such as using Hazers to obscure their vision may be used.

Dropwig graphics are drawn behind foreground objects such as chains and vines, which can obscure them and make them harder to detect.

Ambushing is a behavior that consists of up to four stages: locating a perch, lying in wait, the ambush attack itself and, optionally, pursuit if the ambush attack is unsuccessful.

When a Dropwig enters a room, they look for a suitable spot on the ceiling to perch. While searching for a perch, they often ignore all creatures that do not pose an immediate threat (even prey such as Slugcat).

Once a spot has been found, they curl up on the ceiling and their colors dim to match their environment. In this state, they have a symmetrical profile akin to a downward-reaching claw. They wait until a creature either passes underneath or gets too close to them.

As prey nears their line of sight, they tense up, opening their cerci in preparation for the attack. Once their prey is directly underneath, they drop from the ceiling and attempt to execute one of their two attacks, slashing or grabbing. If the ambush is successful, the Dropwig drags their prey back to their den. Dropwigs are capable of dropping at an angle and often do so should prey linger too close to their line of sight for too long. In this case, their cerci slowly widen the closer they are to attempting the ambush.

After an unsuccessful ambush, they spend ~10 seconds giving chase, periodically leaping at and attempting to slash or grab their prey. If the target is not caught within this time, the Dropwig loses interest and starts looking for another perch. If the prey is caught, the Dropwig takes it to their den. Dropwigs are often aggressive immediately after exiting their den.

Dropwigs are capable of placing bait, typically useful objects or food items, beneath their perch in order to lure prey into an ambush. They may either spawn with this bait or find it and pick it up. Once suitable bait has been acquired, the Dropwig grabs it with their front mandibles and carries it with them until they settle in their ambush spot, after which they drop it beneath them.

Eggbugs have very little health and only require 1 Spear to kill, but they are able to dodge thrown weapons and may be hard to hit from a distance. Attacking an Eggbug in close quarters gives them less time to dodge and makes it easier to land a hit.

Eggbugs release 6 Eggbug Eggs on death which fill 1 food pip each, providing 6 food pips in total. Bringing a live Eggbug into a shelter and killing it inside can be particularly useful, as the food is then stored for later use.

Eggbugs are extremely skittish and are afraid of every creature, including other Eggbugs. When in proximity to creatures they are afraid of, they move faster and more erratically as they attempt to escape.

Eggbugs have good vision and are able to see in every direction at all times. They can hear and may twitch or even jump when startled by noises.

Eggbugs attempt to dodge all thrown weapons, such as Spears and Rocks, by jumping over them.

Red Leeches are the smallest and lightest variety of Leech. 3 or more Red Leeches are typically needed to drown Slugcat. They are commonly found in Drainage System and Garbage Wastes.

Sea Leaches are long, blue, tubular creatures that wiggle as they move. They are larger than other Leech variants.

They are fast and heavy, and they attack in coordinated swarms, making them adept at hunting and drowning other creatures. Sea Leeches are most commonly found throughout Shoreline.

Jungle Leeches are a type of Leech that has the unique ability to survive out of water and drain food pips from Slugcat. They can be found in humid regions such as Outer Expanse.

Jungle Leeches are small, green, tubular creatures. Aside from their green coloration, they are identical in appearance to Red Leeches.

When idle, Leeches swim through bodies of water aimlessly. When they detect prey, they swim towards them and make short lunges in an attempt to latch on. They are only capable of latching on during a lunge. They are relatively slow and can be outpaced by Slugcat's normal swimming speed, but their weight slows creatures down while they are attached, making them dangerous in large numbers. As with other Leeches, they remain attached for a short time after drowning a creature, then leave to search for new prey.

While outside of water, Leeches gradually 'dry out', visually indicated by their coloration darkening and turning black over time. After some time out of water, they detach from creatures and attempt to return to the nearest body of water. Their mobility on land is limited, and they are only capable of slowly crawling along the ground and clearing 1-tile-high jumps. Their movement slows the longer they are outside of water. If they remain out of water for ~23 seconds, they die. This only applies to Red and Sea Leeches, the Jungle ones need to be removed by other methods such as Snails or Worm Grass

Snails can be held and thrown to temporarily stun creatures, giving Slugcat time to escape from predators. This is effective against Leeches; throwing a Snail into a pool of water stuns Leeches in a wide radius, allowing Slugcat to swim past safely. With a well-timed jump, the Snail's pop may also grant a good amount of vertical momentum, allowing Slugcat to reach high places, though this use is fairly niche.

They can be utilized as a distraction, as Slugcat can throw one at one of the Snails' predators, causing them to either catch the Snail and retreat to their den, or sometimes even get trapped in a near endless loop of grabbing the Snail, the Snail popping, the predator getting stunned, the predator attempting to grab the snail again, and so on. This can come in handy for passing dangerous creatures such as Centipedes and Monster Kelp, who often take a long enough time to kill or eat the Snail for the Snail to pop.

Snails are capable of producing a loud pop from within their shells, creating a shock wave which can repel and stun Slugcat and any other similarly sized creatures. There are a few conditions under which Snails may pop:

• When around other creatures. Standing near one causes it to shake with increasing intensity, before eventually popping. Snails may also produce a few smaller pops beforehand, which serve as a warning. The exact speed at which a Snail pops depends on distance, being near instant if touched.
• Shortly after being thrown.
• Hitting a surface with enough velocity. This can be observed when Slugcat drops from a height while holding a Snail.
• Getting hit with a non-lethal object such as a Rock.

A Snail's pop radius is proportional to its size. Pops are considerably stronger in water, up to 5.5 times if both the Snail and the creature receiving the shock are submerged.

Batflies can be caught and eaten to fill 1 food pip. Batflies are wary of Slugcat, but are usually slow in their evasion. They can be caught easily by jumping towards them and grabbing. Catching Batflies may be easier from above, as they often stop and hover in place. Jumping from above also makes it easier to catch Batflies through use of the game's Batfly auto-grab feature. Rocks and Spears can also be used to kill Batflies from afar. Batnip attracts Batflies, which makes them easier to catch. Unlike other food sources, Batflies do not persist in shelters, and are either auto-consumed or deleted.

Batflies can be used to distract certain creatures, such as Pole Plants and Monster Kelp. When thrown in range, these threats may prioritize the Batfly over Slugcat, retreating into their dens to consume them. Batflies can also be used to distract Jetfish and raise reputation with Squidcada.

Batflies can be found in 'hives' around the world, known in-code as swarm rooms. These rooms feature black, white-tipped plants. Every cycle, Batflies attempt to migrate to a new swarm room. Depending on how many Batflies Slugcat has killed, multiple Batfly hives may be empty. When a hive is empty, the plants lose their white tips. Active Batfly hives are indicated on the map by pulsing blue rings.

The white-tipped plants that Batflies nest in also act as Batfly-exclusive travel pipes. When a threat gets too close to a Batfly, they may dive and burrow into these plants. After a few seconds, they re-emerge from a different plant elsewhere in the room. Batflies can still be grabbed while in their burrowing animation.

Batflies can hang upside down from ceilings, poles, and even each other, forming stacks. If a Batfly with others attached to it from below starts flying, the attached Batflies may not separate, and they can end up struggling to fly. If Slugcat grabs a Batfly attached to a chain, the entire chain is picked up until the other Batflies fly away. This can result in strange physics if the Batflies are still attached to the ceiling.