Arthropods are the group of animals that have jointed appendages. They are distinguished from other animals by their external skeletons and segmented bodies. Arthropods include beetles, spiders, crabs, scorpions and centipedes.
All arthropods are made up of segments, and each segment contains a pair of appendages, even if the segments have become fused together to form what looks like a single mass. The appendages themselves are segmented. Some are uniramous, meaning that the segments do not branch, while other are biramous, meaning that the appendage contains branches.
The segments of an arthropod function as the bones do in a human or other similar creature. They are made up of chitin, a tough fibrous substance that is flexible yet strong. The muscles that power each appendage attach to the inner wall of the segments, a situation exactly opposite to that seen in humans, where the muscles lie on top of rather than inside of the structures to which they attach.
The appendages of arthropods include but are not confined to legs. The antennae or feelers present on many insects and crustaceans are actually modified appendages, and so are the spinnerets of spiders. Maxillae, which resemble jaws, and mandibles, which resemble large fangs, are appendages modified for chewing and biting. Some arthropods have appendages that function as reproductive organs.Learn More
Omnivores are organisms that eat foods from both animal and vegetable sources. Small insects, human beings, some small animals, birds and reptiles are all examples of omnivores.Full Answer >
Fruit flies are among the smallest members of the Order Diptera and have large, pronounced compound eyes, oval-shaped bodies and a set of four wings, much like larger flies. Fruit flies average approximately 1 millimeter in length, and females are slightly larger than males. They closely resemble many fly species in appearance, sharing the same unique body shape, large wings and bulging eyes, but have several key biological differences.Full Answer >
Some animals that eat caterpillars are wasps, reptiles, certain mammals and birds. Of these animals that prey on caterpillars, birds are their main predators. The caterpillar is the larval stage of insects like moths and butterflies.Full Answer >
The vast majority of animals with ocular media, including fish, amphibians, insects and other invertebrates, reptiles, birds and some mammals are capable of seeing ultraviolet light. Goldfish, mantis shrimp, butterflies and eagles are a few examples, while hedgehogs are one of the most UV-sensitive mammals.Full Answer >