Gammarus
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Gammarus is an amphipod crustacean genus in the family Gammaridae. It contains more than 200 described species, making it one of the most species-rich genera of crustaceans. Different species have dif
Northern pike
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The northern pike, also known as jack, northern or simply pike, is a species of carnivorous fish of the genus Esox. It is commonly found in fresh waters of the Northern Hemisphere.
Skull of a northern pike
A pike in its natural habitat in Germany
The tiger muskellunge is a hybrid of the northern pike and its North American relative, the muskellunge (E. masquinongy).