changing shape. Its ability to change shape is from the pseudopodia, which are common in eukaryotic microbes. The pseudopodia grants the microbe an ability to extend and contract into any possible shape.
The Amoeba proteus can be described as unicellular, colorless, or transparent. The average size of an Amoeba proteus varies around from 0.2 to 0.3 mm in diameter but larger forms have been found measuring up to 0.5 mm in diameter which is visible to the eye. Amoeba proteus prefers to habitat clean ponds of highly oxygenated fresh water. It is found in large food webbed ecosystems that contain lots of algae and plants. Since it is adverse to light it will take cover under anything that provides shade, usually lily pads.
Source: Microbe Wiki