Animals are multicellular, eukaryotic organisms belonging to the biological kingdom Animalia. With few exceptions, animals consume organic material, breathe oxygen, have myocytes and are able to move,
Sexual reproduction is nearly universal in animals, such as these dragonflies.
Predators, such as this ultramarine flycatcher (Ficedula superciliaris), feed on other animals.
Hydrothermal vent mussels and shrimps
The blue whale is the largest animal that has ever lived; it can be up to 33.6 metres (110 ft) long.
Nemertea is a phylum of animals also known as ribbon worms or proboscis worms, consisting of about 1300 known species. Most ribbon worms are very slim, usually only a few millimeters wide, although a
Gorgonorhynchus repens, a species within class Anopla, discharges a sticky branched proboscis.
Stylet-containing part of proboscis of "armed" nemertean Amphiporus ochraceus.
Brain and neural cords of hoplonemertean Amphiporus ochraceus. Several clusters of dark eyespots and the opening of one cerebral organ are also visible.