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Animal
Sexual reproduction is nearly universal in animals, such as these dragonflies.
Sexual reproduction is nearly universal in animals, such as these dragonflies.
Predators, such as this ultramarine flycatcher (Ficedula superciliaris), feed on other animals.
Predators, such as this ultramarine flycatcher (Ficedula superciliaris), feed on other animals.
Hydrothermal vent mussels and shrimps
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.
The blue whale is the largest animal that has ever lived; it can be up to 33.6 metres (110 ft) long.
Nemertea
Nemertea
Gorgonorhynchus repens, a species within class Anopla, discharges a sticky branched proboscis.
Gorgonorhynchus repens, a species within class Anopla, discharges a sticky branched proboscis.
Stylet-containing part of proboscis of "armed" nemertean Amphiporus ochraceus.
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 visibl
Brain and neural cords of hoplonemertean Amphiporus ochraceus. Several clusters of dark eyespots and the opening of one cerebral organ are also visible.