Eggs
All fleas begin life as an egg. According to the University of Florida, a female flea can lay up to 500 eggs in a six-month lifetime but only lays up to 18 in a clutch.
Larvae
One to 12 days after being lain, an egg hatches into tiny a worm-like larva that eats whatever organic material it can find.
Moulting
Many larvae of flea species go through three molts. Each time they emerge from their old bodies into slightly bigger larvae.
Pupae
When the larva is about 2 weeks old, it spins a cocoon to transform into a pupa, then emerges as an adult. This stage can last for months, depending on the weather.
Adult
The adult only breeds and feeds on the host but lives in furniture, bedding, and in the yards, paddocks and stalls of their hosts. The adults are easiest to kill.