Fleas cannot survive on clothing. Fleas prefer environments that are wet and humid, and they will live on any host that is warm-blooded. Fleas are incredibly small, with adults typically reaching a maximum length of 0.3 centimeter.
Fleas do not have wings but can leap over 1 meter using their legs. Fleas are able to survive for over a year on just one meal of a host's blood. There have been over 2,000 different types of fleas found throughout the world. Research indicates that some types of flea have been in existence for a very long time, perhaps close to 100 million years.