A group of species that fill similar ecological niches (e.g., birds that eat bugs from tree bark), but separated by time or geography so they don't compete. Also: a permaculture term for harmonious plant assemblies gathered around a central element. Planted around an orange tree: rue and lavender to repel pests, nasturtiums to smother weeds and grasses, clover and vetch for nitrogen, and an albizia tree to attract ladybirds to eat aphids. The guild is a version of companion planting.