1.Reptiles
Why it happens: In warmer areas, snakes may slither up toilets by entering through exposed pipes or sewer systems while looking for food, such as frogs or rodents.
Things to keep an eye out for include movement within the bowl or an unexpected visitor when you raise the lid (yikes!).
To stop them, use a one-way valve or a toilet vent cover.
Seal any gaps or fissures around your home’s exterior and plumbing vents.
Close the toilet lids, especially at night.
Reduce the amount of plants surrounding the house to keep predatory animals away.

2.The Rat
Rats can hold their breath for minutes and are very good swimmers, which is why it occurs. They sometimes infiltrate homes through toilets and then enter the sewer system.
Squeaking, scratching, or worse, seeing one swimming in your toilet, are things to be on the lookout for.
Ways to prevent them:
On sewer lines, install rat guards.
Check for and seal any cracks or openings close to the plumbing.
Food and grease that draw rodents into the system should not be flushed.
Enquire with a plumber about adding a rat flap valve to your sewer system.
3.The frog
Why it occurs: Frogs frequently get into open drains or vent pipes, particularly in humid environments. It’s a bug haven if there’s standing water with insects around.
Things to keep an eye out for are small green jumpers in the bowl or chirping sounds.
Installing a fine mesh screen over roof vent pipes is one way to block them.
Use screens or keep the windows closed in your bathroom.
Replace any adjacent sources of standing water and repair any leaking faucets.
4.Spiders and Insects (Cockroaches, Water Bugs) Origin: These pests frequently enter through bathroom drains, particularly during hot weather or following precipitation. They seek out food or moisture.
Bugs
Ways to prevent them:
Keep the bathroom and toilet dry and clean, and use drain stoppers while not in use.
Every week, pour a mixture of vinegar and baking soda down the drain to keep bugs away.
Think about using natural bug repellents, such as peppermint oil.
5.Lizards, which are little reptiles and geckos
The reason it occurs: These microscopic organisms can fit through narrow openings and enter plumbing systems by following warmth or insects.
Keep an eye out for: Rapid motions, rustling behind the toilet, or discovering them relaxing in the bowl.
Ways to prevent them:
Keep the screens on your exhaust fans and windows.
Because bathroom lights draw insects, which in turn draw lizards, turn them off at night.
Especially close to the plumbing, seal off tile gaps and wall fractures.
🙠 Bonus Advice: Prevention of Toilet Creatures 101
Make sure to always keep lids locked.
Install pipe and drain screens.
Arrange for routine plumbing examinations.
Avoid flushing hair, oil, or food as this will draw pests.
Discuss non-return valves for your pipes with a plumber if you reside in a high-risk location.