Well, it's written right in the title: "Earth's land mammals by weight". So no, it doesn't include bacteria, insects, other invertebrates, or anything living in

Well, it's written right in the title: "Earth's land mammals by weight". So no, it doesn't include bacteria, insects, other invertebrates, or anything living in the sea, but the point it's trying to make about the impact of humans on the planet is still important...