ectoparasitism

例句：

1. 1. Theectoparasite is a parasite that lives on the surface of its host.
   外寄生虫是一种寄生在宿主表面的寄生虫。
2. 2.Hematophagy is the consumption of blood by certain animals to survive.
   血吸虫是某些动物为了生存而摄取血液的行为。
3. 3. Ectoparasitism is a type of parasitism where the parasite lives on the surface of its host.
   外寄生是一种寄生方式，其中寄生虫生活在宿主的表面。