Hydra sp. - a freshwater cnidarian. The size of the animal is about 1 cm. The photo is also known under the name "Dancing hydra." Unlike many other images, it's a single almost unedited shot.The image won the first place in a Russian contest "Art of Science Festival 2012"
Scapholeberis mucronata,a head and an eye of a water flea. The size of the whole animal is about 0.6 mm, while the head is just a small part of the body. This image is made with a 100x lens with DIC illumination.
Freshwater colony of volvox algae. The image is made in polarized light. The green spots inside the sphere are resting stages of the algae in which the organism can endure winter cold and desiccation.