While generally human intervention and poaching in a population is a negative thing, in some areas the yacare has benefited from human impact. The populations of this animal have declined due to hunting in countries such as Bolivia and Paraguay, but the trend seems to be reversed in areas such as the Pantanal in Brazil. Poachers generally are able to find the largest caimans during the dry season, where they are often captured and killed for their hides. The smaller individuals are left alone, and as humans decreased the number of large individuals, more small caimans were able to fill in their space. So effectively, humans have decreased the average body size, but increased the population size in some areas.
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