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from article Olenellina

A fossilized Olenellus trilobite belonging to the suborder Olenellina. This trilobite was discovered among the Early Cambrian strata of the Eager Formation in British Columbia, Canada. (Credit: Houston Museum of Natural Science)

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from article Sunfish

Bluegill (Lepomis macrochirus). (Photo by Eric Engbretson, U.S. Fish and Wildlife Service)

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from article Archiacanthocephala

Life cycle of the giant thorn-headed worm of hogs.

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from article Cetacea

Dusky dolphins (Lagenorhynchus obscurus) in the coastal waters of New Zealand. (Credit: Mridula Srinivasan/Assessment and Monitoring Division, Office of Science and Technology, National Marine Fisheries Service, National Oceanic and Atmospheric…

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from article Cetacea

Killer whale (Orcinus orca) in Monterey Bay, California. (Credit: Tory Kallman/Getty Images)

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from article Cetacea

A humpback whale opens its mouth wide to collect prey, and then filters food from the water using its baleen. (Credit: John Tunney/Shutterstock)

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from article Cetacea

Sperm whales (Physeter macrocephalus). (Credit: Gabriel Barathieu)

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from article Cetacea

Skeletal reconstruction of Ambulocetus natans. (Credit: J. G. M. Thewissen)

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from article Cetacea

Cetacean fossils. (a) Left upper premolar. (b) Skull of Dorudon atrox (alternatively Prozeuglodon stromeri) from the early Oligocene of Egypt. (c) Skull of Delphinodon dividum from the middle Miocene of Maryland. (Copyright © McGraw-Hill Education)

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from article Hymenostomatida