[header] How to kill fleas and ticks on cats [title] Learn what fleas look like. [step] Most people think that fleas are microscopic, but if you look closely you can see them without a magnifying class. Adult fleas are very small, less than 1/8 inch long. 
They're reddish-brown insects and they don't have wings, but they can still jump very high. [substeps] Fleas' bodies are laterally compressed, so their bodies are wider from back-to-belly than they are from side-to-side.