December 12, 2017

Mollusks

Mollusk

Mollusks are invertebrates that live in ocean, freshwater and terrestrial habitats. It is estimated that there are as many as 120,000 different species of mollusk. There are several different classes of mollusk. The most common mollusks are the gastropods (e.g., snails and slugs), the cephalopod … [Read more...]

Annelids

Worms

Annelids are invertebrates consisting of over 17,000 species of worms including ragworms, earthworms, and leeches. Annelids can be found in moist and wet earth, as well as marine and freshwater environments. Many annelids, such as leeches, are considered parasites. Annelids range in size from … [Read more...]

Insects

Insect

Insects are a type of invertebrate, meaning they don't have an internal skeleton or backbone. Insects are also a type of arthropod. The term arthropod comes from the Greek word meaning "jointed feet," and includes other similar animals such as crustaceans and arachnids. Insects are one of the … [Read more...]

Birds

Bird

Birds are defined as winged animals with two legs that lay eggs. In addition to the wings, birds have two other easily recognizable characteristics. They are covered with feathers, and they have a beak with no teeth. Birds are warm-blooded animals, meaning that they internally regulate body … [Read more...]