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Frog zoology
About 400 million years ago, some members of the sarcopterygian group of fish moved onto land. These became the first amphibians. Today, these animals still spend part of their lives in water and ... > more -
Zebra mussel
The Zebra mussel (Dreissena polymorpha) is a bivalve mussel native to freshwater lakes of southeast Russia. Zebra mussels are currently causing serious problems in North America and Sweden, where ... > more -
Horseshoe crab
The horseshoe crab (Limulus polyphemus) is an arthropod that is more closely related to spiders than crabs. Horseshoe crabs possess the rare ability to regrow limbs lost. Limulus has been extensively ... > more -
Bald Eagle
The Bald Eagle is a bird of prey indigenous to North America, most recognizable as the national bird of the United States. The species was on the brink of extinction late in the 20th century but has ... > more -
Mudskippers
Mudskipper are members of the subfamily Oxudercinae (tribe: Periophthalmini), within the family Gobiidae (Gobies). While most marine fish live in intertidal habitats, surviving the retreat of the ... > more
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