snail
「蝸牛」 has another reading with different meanings.
雨の日に庭で蝸牛を見つけた。
I found a snail in the garden on a rainy day.
蝸牛はゆっくりと葉っぱの上を這っていた。
The snail was slowly crawling along a leaf.
子供が蝸牛を拾って大事そうに観察していた。
The child picked up a snail and was carefully observing it.