Venus flytraps, for example, share an ancestor with Portuguese sundews, which only catch prey passively, via "flypaper" glands on their stems.

例如，维纳斯捕蝇草和葡萄牙茅膏菜有共同的祖先，后者只通过茎上的“捕蝇纸”腺体被动地捕捉猎物。