Sandoon

Sandoons are sandy monsters with pink antennas on their head that appear in Mario & Luigi: Dream Team. In the field, Sandoons are submerged in the sand and their eyes are the only parts visible unless approached, and at that point the Sandoon jumps out of the sand and chases Mario and Luigi relentlessly for a while if it notices them.

In battle, Sandoons may attack by submerging themselves and appearing before the Bro. they're about to charge into while still half-submerged, who must jump to avoid it. Sandoons can also attack by looking at the Bro. they're about to attack, submerging themselves to the point only their eyes can be seen occasionally, then sticking its eyes out each time it gets nearer to the Bros., once close enough, it will pop out under them to swallow them whole. Mario or Luigi must hammer the Sandoon's eyes when it pops out right before the targeted Bro.

If eaten, the Bro. will take damage on that Sandoon's every turn including the turn it eats the Bro., but is given a chance to do small but plentiful amounts of damage by frantically shaking about in the Sandoon's mouth while taking damage before attempting this himself. While inside the Sandoon, any damage the Sandoon takes from the other Bro., the Bro. takes half of that. Once the Sandoon holding the Bro. captive is defeated, the Bro. is freed.

Trivia

 * If a Sandoon gulps a Bro. while a Boo Biscuit is active, it will automatically deactivate for Mario and Luigi and the eaten Bro. will be liable to taking damage while in the Sandoon. This is a rare case of this happening.