This electron micrograph depicts an amoeba, Hartmannella vermiformis (orange) as it entraps a Legionella pneumophila bacterium (green) with an extended pseudopod.
After it is ingested, the Legionella pneumophila bacterium can survive as a symbiont within what then becomes its protozoan host. The amoeba then becomes what is referred to as a ”Trojan horse”, for by harboring the pathogenic bacteria, the amoeba can afford them protection, and in fact, in times of adverse environmental conditions, are able to metamorphose into a cystic-stage enabling it, and its symbiotic resident pathogens to withstand such environmental stresses.
Humans think of themselves as the most important creatures ever to walk the planet. But when it comes to size, humans are mere peanuts next to some animals. Here’s a look at some of the biggest animals that have walked our planet, present and past. 10 of the biggest animals to roam the planet