August 18, 2017

Vertebrates

Vertebrates

Vertebrates are animals with an internal backbone or spinal column. There are over 85,000 species of vertebrate animals such as amphibians, birds, fish, mammals and reptiles. Most large land animals are vertebrates. Even large sea animals, such as the whale, are vertebrates. However, only about 5% … [Read more...]

Reptiles

The Crocodile is a common type of Reptile

Reptiles are some of the oldest life forms on Earth, with fossils dating back about 320–310 million years. Reptiles are cold-blooded, four-legged vertebrates that inhabit every continent of the world, except Antarctica. A reptile's skin is covered with a tough external plate or scute, such as the … [Read more...]

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...]

Mammals

Primate

Mammals are a class of vertebrate animal. If you are reading this, there is a very good chance you are a mammal. More specifically, you are a probably a primate of the human family. The term mammal comes from the fact that female mammals have mammary glands that produce milk to feed their young … [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...]

Invertebrates

Invertebrate

Invertebrates are animals with no internal skeleton or backbone. Invertebrates make up about 95% of all animal species on Earth. Types of invertebrates include annelids, arachnids, cnidaria, crustaceans, echinoderms, insects, mollusks, and protozoa. Exceptions include amphibians, birds, fish, … [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...]

Crustaceans

Crab

Crustaceans are a type of invertebrate, meaning they don't have an internal skeleton. They are also part of the arthropod family of animals. The term arthropod comes from the Greek word meaning "jointed feet," and includes other similar animals such as insects and arachnids. Even if you are not … [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...]

Amphibians

Amphibian, Frog

Amphibians begin life as water-breathing animals, and then in maturity evolve into an air-breathing animal. Amphibians are also cold-blooded animals, meaning they rely on external, environmental heat sources, such as the Sun, to control their body temperature. Examples of amphibians include … [Read more...]