Everyone knows what a flea is, right? Your animals will get them for being outside a lot and if you don't bathe them a lot or give them medicine to get rid of them, then they are going to swarm your home. They are super small and really fast. If you don't catch them on your first try then they are just going to keep running away. Another way they can get away is by jumping. These critters can jump almost almost 130 times higher than their own height!
Do you want to know what the most dangerous animal in the world is? I'll give you a hint. They are pretty small, annoying, and they fly around all day. I'm talking about a fly. You wouldn't think that they're dangerous, usually they just annoy everyone by landing and crawling on them, but since they fly around and eat poop all day they can carry some nasty diseases.
The next fact is about snakes. Some are poisonous, some are venomous, and most just bite you to protect themselves. They also live on Earth. A lot of them aren't that big either, so you think it would be hard for them to eat other animals, but they do. They don't eat any type of plant, only other animals. Incredible right? Imagine how hard it is for them to eat, their mouths are really tiny. They probably just try and swallow them whole.
Last fact. You know lizards? 40 years ago they found a population of some special lizards in Armenia. They were all female. Not a single male in sight, how did they breed?