蛇
ジャ, ダ, イ, ヤ, へび, あぶ, み
snake, serpent, hard drinker
JLPT1 G7 S11 F1721
As per
它
# (snake) + 虫 insect/creature → *snake/serpent*. 蛇 was devised to replace
它
.
[Full Kanji Etymology List]