Blood-sucking insects are a type of arthropod that feed on the blood of other animals. Two of the most common examples are fleas and ticks, both of which have four letters in their names. Fleas are small, wingless insects that can jump long distances and are often found on pets. Ticks are also small, but they have eight legs and attach themselves to their hosts. Bedbugs are another type of blood-sucking insect, with six letters in their name. They are oval-shaped and reddish-brown in color, and they usually hide in cracks and crevices during the day. All three of these insects can cause discomfort and irritation to their hosts.