Fetching details from the dictionary...

chicken bones (e.g. for soup); chicken carcass
poor-quality coke (coal)
left-overs; remnants
「殻」 has other readings with different meanings.
料理のためにえびの殻を丁寧にむいて食べた。
I peeled the shrimp shell and ate it.
朝食の後で卵の殻を集めてゴミ箱に捨てました。
After breakfast, I collected the eggshells and threw them in the trash.
殻が固くてなかなか割れない。
The shell is hard and difficult to crack.