A common question that comes up when a person is trying to get rid of bed bugs is, “How large are bed bugs?” Bed bugs can vary from the size of a pinhead to the size of an adult. They are nocturnal and feed when humans are asleep. Before they begin to feed, they are only translucent and hard to spot. It can take up to six weeks for them to molt and grow into an adult.
The size of an adult bed bug can vary, but these bugs are small, oval-shaped and rusty red in color. They are about one-fourth to one-sixteenth of an inch long. Their size increases as they feed, and they can be spotted by sight. Bed bugs are usually active at night and hide during the day. They can leave a reddish-brown mark on your bed, but if you are unable to see it without a microscope, it could be an egg.
A well-fed bedbug will be much darker than a starving one. They will also be flatter and transparent. Starving bedbugs will be brighter and more transparent, like small balloons. However, it is important to note that a bedbug can go up to 18 months without feeding. The lifespan of an adult bed bug depends on many factors, including temperature and access to a host.