Sea Horse

Tiny beast, unaligned
Armor Class 11
Hit Points 1 (1d4 - 1)
Speed 0 ft., swim 20 ft.
STR
1 (-5)
DEX
12 (+1)
CON
8 (-1)
INT
1 (-5)
WIS
10 (+0)
CHA
2 (-4)
Senses passive Perception 10
Languages
Challenge 0 (0 XP)

Water Breathing. The sea horse can breathe only underwater.

Monster Manual (SRD)