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Nematode parasites in the stomach of a healthy adult male eastern grey kangaroo (Macropus giganteus). The larger parasites (Labiosimplex spp.) are about 100 mm in length and occur in numbers up to 500. The smaller parasites, predominantly Pharyngostrongylus kappa, Rugopharynx spp. and Cloacina spp., typically occur in tens of thousands. Photo by Graeme Coulson. (Online version in colour.)
