It would be insanely cool if the pond area added in the summer update came with a crab as a new Tier 4 park boss. I'd imagine that a player would find the crab's lair in an underwater cave that surfaced and opened up to a damp, underground cavern with puddles of water everywhere.

Each of the bosses added thus far have both been escaped pets, and a crab could slot into this theme quite well. Maybe some stupid kid came to the park and threw their pet crab into the pond, or a crab from the grocery store thawed out and found its way into the park's pond.

Plus, a crab would fit the challenge and stature of a Tier 4 boss due to its large size, sturdy shell, and massive claws. Defeating the crab would reward its chunks, claws, and eyestalks, which would make for some incredibly powerful gear. An armor set, a dual wielding weapon using its claws, and a new mage staff are all things that could be crafted with this loot.

A crab should be considered as a park boss over the more obvious choice of a frog or toad because there is already a lizard boss in the game that uses its tongue to attack, and a frog/toad would likely function too similarly to the lizard for it the be a unique fight. As well as this, frogs/toads are not very durable and are often easily taken down in the real world by tarantulas, one of said tarantulas being the first and easiest park boss in the game. This would not make sense if a frog or toad was found as a boss and was more challenging than AXL. A crab, however, would make for a much more interesting and dynamic fight, with the boss using its large claws to both directly attack and to fling sediment at the player.

I love this idea, and the development team for Grounded 2 should consider it. Thank you, goodbye, and happy crabbing!

Like the boss idea. It will really fit. It could also be a sweetwater crab (Astacus astacus), or one of them can be added as a normal mob, while the other - a boss.

I personally think the lizard was too big for this game. If it was a regular Lizard (Viviparous lizard) see image below, it would be a much better fit for the scale of the game.
This armored monster seemed too crazy to me, but I guess AXL did lift the ceiling a lot. They can still be added as normal mobs for tier 4. They are big enough to fit, and losing their tails can become a mechanic in a similar (but different) fashion to the ****roaches.

Another interesting bug that can be added would be simple water spiders (Gerris lacustris) would fit great, since they are very often seen on water surfaces during spring/summer.