In horticulture, the word "pests" is usually used for macroscopic animals, although smaller organisms (e.g. bacteria, fungi, viruses, nematodes) could be considered pests, as well as invasive plants (e.g. vines and parasitic plants).
Macroscopic animal pests are dominated by insects and mammals, although other arthropods, reptiles, and birds could all be pests.
All of these groups primarily contain beneficial or neutral organisms, so generally control methods should be limited and in the form of deterrents rather than chemical poisons.