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.
There are three main types of plankton: 1  Plant plankton, also known as phytoplankton â single-celled photosynthetic organisms which manufacture food using energy from sunlight. 2  Zooplankton â single-and many-celled animals that feed on live plankton. Plant plankton, also known as phytoplankton â single-celled photosynthetic organisms which manufacture food using energy from sunlight. 2  Zooplankton â single-and many-celled animals that feed on live plankton.