Flora and Fauna
- 801
- Edible Sea Urchin: Echinus esculentus
- Photographs and information from ARKive including classification, status, description, range, habitat, biology, threats and conservation.
- 802
- Purple Sea Urchin: Strongylocentrotus purpuratus
- Photographs and information from ARKive including classification, status, description, range, habitat, biology, threats and conservation.
- 803
- Red Sea Urchin
- Information from Wikipedia on this species, Strongylocentrotus franciscanus, including its description, feeding habits, behavior and reproduction.
- 804
- Sea Urchin: A Stinging but Amazing Animal
- Article by Jean-Marie Cavanihac on these animals with many photographs of their development.
- 805
- Sea Urchins Revisited
- Photographic study by Jean-Marie Cavanihac of the sea urchin with some microscopic features of interest to the amateur naturalist.
- 807
- Who is in Charge Here?
- Illustrated article by Richard L. Howey considering how creatures with no brains, such as the sea urchin, react appropriately to their surroundings.
- 809
- Venomous Snakes
- Find general information about several species including copperhead, coral, cobra, cottonmouth, rattle, and sea snakes. Includes photographs.
- 810
- ADW: Class Holothuroidea
- Photographs and information on the sea cucumbers from the Animal Diversity Web.
- 811
- Athyonidium chilensis
- Images and brief information about this Chilean species (Dendrochirotida: Cucumariidae).
- 812
- Cotton-Spinner (Holothuria forskali)
- Whilst diving round the coasts of Britain, Jane Lilley observed this sea cucumber and its behavior.
- 814
- Holothuroidea
- Wikipedia article on this class of marine animals, the sea cucumbers, with elongated bodies and leathery skin.
- 815
- Holothuroidea - Sea Cucumbers
- Overview, including characteristics, taxonomy, phylogenetic relationships, and fossil history.
- 817
- Sea Cucumber: Holothuria pardalis
- Research project by Ka Wai Hui on this species, including its classification, habitat, reproduction, nutrition, adaptations and use to humans.
- 819
- Albany Adder: Bitis albanica
- Photographs and information from ARKive including classification, status, description, range, habitat, biology, threats and conservation.
- 820
- American International Rattlesnake Museum
- Includes pictures and descriptions of sixteen snakes ranging from the Arizona Black Rattlesnake (Crotalus viridis cerberus) to the Western Diamondback Rattlesnake (Crotalus atrox). Also provides facts regarding how dangerous rattlesnakes are, what to do if bitten, and descriptions of the snakes' coil and strike positions, rattles, head shapes, and fangs.