Freshwater volvox colony. Inside you can see zygotes that will survive in winter time. In favorable conditions volvox reproduces asexually and new colonies are formed inside and then leave the "parent." You might notice that zygotes are concentrated only in one half of the colony. That's the posterior (rear) end, which means when the colony swims, the zygotes stay in the back.
Hydra sp. - a freshwater cnidarian. A very common animal in lakes and ponds. It captures small invertebrates such as water fleas. Single shot taken with an electronic flash.
Hydra sp. - a freshwater cnidarian with ingested water flea inside. The shot was taken with a supermacro lens.