1. Arachnids
Spiders usually don't come into your toilet through the pipes. However, they can hide under the toilet seat and even make a web there. If you live where there are harmful spiders, it's very important to carefully look inside your toilet before sitting to prevent accidents. Keeping your toilet clean can also help prevent spiders from being attracted to it.
2. Small reptiles
If you live where there are many lizards, remember they can get into your toilet easily. A lot of lizards enjoy water and are small enough to enter through your pipes. Lizards are usually attracted to your toilet by small bugs. Keeping your toilet very clean can really help lower the risk.
3. Rodents