Did you know ...
A flea is a parasite that lives on mammals or
birds. There are 2,500 species of fleas. Fleas pierce skin and suck on blood.
Fleas are very good at jumping. Fleas only grow to 3 mm long, but they can
jump 50 times their body length. No one likes fleas. At best their bites itch.
At worst they bite rats, and then the rats can spread serious diseases such as
the bubonic plague. The Black Death in 1350 killed an estimated 50 million