格拉普托利特是微小的，滅絕的動物，生活在一起的團體或殖民地，並共用相同的骨架，這就像一個公寓樓。每種動物都建造了自己的"公寓"或活室 插畫檔

Illustration of a Graptolites are tiny, extinct animals that lived together in groups or colonies and shared the same skeleton, which was like an apartment building. Each animal built its own “apartment” or living chamber