This fish doesn’t rely on its eyes to tell if it got its color camouflage right -- it uses its skin.
Found in lakes and rivers worldwide, single-celled creatures like these Paramecium bursaria can both eat and photosynthesize. Microbes like this play a double role in climate change, releasing or absorbing carbon dioxide -- the heat-trapping greenhouse gas that is the primary driver of warming -- depending on whether they rely on an animal-like lifestyle or a plant-like lifestyle. Credit: Daniel J. Wieczynski.