Giraffe Characteristics. The giraffe is the tallest living animal which is instantly recognizable by its exceptionally long neck. Adult males stand 15 â 19 feet (4.6 â 6.0 metres) tall, whereas females are shorter at 13 â 16 feet (4 â 4.8 metres) tall.
Bacterioplankton are bacteria and archaea, which play an important role in remineralising organic material down the water column (note that many phytoplankton are also bacterioplankton). Plankton are found throughout the oceans, seas and lakes of Earth.
Zooplankton Fact Sheet. Zooplankton are microscopic invertebrate animals that swim or drift in water. They are at the base of the food chain, feeding on microscopic plants and being fed upon by aquatic insects, fish and salamanders. Their sizes usually range from one-tenth of a millimeter to four millimeters, which is smaller than the head of a pin.