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Cichlids

[http://evolution.berkeley.edu/evosite/evo101/VIIB1aAdaptiveRadiation.shtml A few of the many mouth morphologies found in Lake Malawi's cichlids]. Based on geological evidence, the nearly 1000 species of cichlid in Lake Malawi evolved in the last few million years, coming to occupy [http://malawicichlids.com/mw01100.htm a range of ecological niches].