How To Identify Lizard Poop vs Mouse Poop: [Pest Control Tips]

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Poop is a disgusting topic to discuss anyway. But lizard poop? You must learn how to identify lizard poop vs mouse poop. Why? Because both these pests are capable of spreading different diseases through their poop. Moreover, they are pests. And for you to take effective action, you must know which pest you’re dealing with!

Lizard poop vs. mouse poop: All you need to know.

Lizard Poop vs Mouse Poop

Here are the most important differences you can use to identify lizard poop vs. mouse poop in your house!

What does lizard poop look like in appearance?

Lizard poop is best described as a black dropping with a white tip on one end. The white part of lizard poop is the Uric acid crystals. Lizard poop will have these crystals in it, and this is one of the differentiating factors from mouse poop.

Interestingly, the size of droppings can differ depending on the size and species of lizard. For example, smaller lizards will commonly leave droppings that are about the size of a grain of rice. In comparison, larger lizards may produce dropping sizes around 1/2 inch long.

Lizard droppings that lack a white tip are usually dry. This characteristic makes it relatively easy to distinguish lizard poop from mouse droppings, which are often wet and contain urine.

When it comes to identifying lizard poop in your home, there are a few pointers you can keep in mind.

Size of the droppings

Lizard droppings are small and one-eighth inch wide. They are dark brown or black in color and have a blunt end. If you see these droppings in your home, it is likely that you have a lizard infestation.

Color of lizard feces

The shape and appearance of lizard droppings are typically dark and pellet-shaped. Additionally, the black part of the droppings is usually dry while the white tip remains wet and squishy.

Location of lizard poop

Lizards tend to leave their droppings in open areas, so if you’re seeing them frequently, then there’s probably a good chance you have lizards hanging around as well.

Where do lizards generally poop?

Lizard poop

Lizards generally poop wherever they are lying. This means that you can find lizard poop on the ground, on walls, and even on ceilings. If you see droppings that look like they could be from a lizard, take a closer look to make sure.

Since lizards have a good view of predators from their chosen spot to poop, they will generally select an elevated area like a rock, the top of a fence post, or on the roof of a building.

Lizards will also typically leave their droppings in inconspicuous areas as a way to communicate with other lizards. This is especially common among male lizards, who will often use their droppings as territorial markers.

Are house lizard droppings or feces dangerous for human beings?

Yes, house lizard droppings or feces can be dangerous for human beings. However, house lizard droppings or feces are not dangerous for you if you take adequate precautions while handling them.

You must always clean feces while wearing gloves. Further, after handling your pet lizards, clean your hand with soap and water thoroughly.

What are the dangers and diseases that lizard poop or feces can spread?

Bacteria under the microscope.

Lizard poop is generally known to contain the bacteria Salmonella, which is known to cause food poisoning. This is why it is always important to wash fruits and vegetables before eating them, even if you are going to wash them later.

Apart from a dangerous disease like salmonellosis, lizard poop can also cause diarrhea, prolonged fever, abdominal cramps, and vomiting.

It is important to be able to identify lizard droppings so that you can take the necessary precautions to protect yourself and your family from these dangers.

When is lizard poop harmful or toxic for you?

Lizard poop is not harmful to humans until you come in direct contact with it. But, lizard poop is toxic if it is in contact with your skin, you smell it, or you inhale it.

So, if you see any lizard poop around your house or workplace, avoid touching it, and make sure to keep your windows open so that the smell does not affect you.

Further, it is important to take steps to remove them and keep the area clean. However, if you are ever bitten or scratched by a lizard, seek medical attention immediately.

What does mouse poop look like in appearance?

Mouse poop and urine

Here are some salient points about the appearance of mouse poop to help you identify them in your home and compare it to the appearance of lizard poop!

Mouse droppings generally measure a quarter of an inch in length.

Typically, mouse droppings range in size from 1/8 to 1/4 of an inch. A mouse doesn’t leave behind even one dropping. Therefore they stand out. Mice urinate whenever they are moving about, and they don’t care where they do it.

Mice freely excrete when they move from their nests in search of food and additional nesting materials. Every day, a single mouse will deposit 50 to 75 droppings, almost always outside of its nest.

Mouse poop is typically grainy in texture and black in color.

Mice droppings are about the size of a grain of rice. They are black and very shiny. The feces will be soft when fresh, but they will dry out and become harder and more brittle over time. It will also change color to a grayish-black hue.

In stark contrast, lizard droppings are tubular in shape and typically brown in color. Even though I say that mouse poop is typically black in color, it could vary.

And the reason for that is the varied diet of mice! These pests eat anything and everything they can get their paws on, be it cheese or be it meat!

Mice and rats generally poop in pantries, attics, vents, crawl spaces, cabinets, and similar areas of a house.

Mice poop in closed areas like pantries.

We already know that mice like areas of your house that are shielded from predators and too much activity. Further, these pests, owing to their size, can fit into tight spaces that are hidden from plain view.

Therefore, a half-inch gap in the wooden boards of your basement is more than enough for these pests to crawl through!

Mice and rats generally poop in pantries, attics, vents, crawl spaces, cabinets, and similar areas of a house. The presence of rodent droppings is an indicator that you have a pest problem and should take action to get rid of the rodents.

In fact, you can even follow the trail of mouse poop in your house to find out the various spaces that your uninvited home guest is frequenting.

Does mouse poop contain harmful viruses and bacteria that could be dangerous to human beings?

Mouse droppings can harbor harmful viruses and bacteria that could be dangerous to human beings. These viruses and bacteria can cause serious health problems, including, but not limited to, respiratory problems, diarrhea, and even death.

In fact, mice droppings and urine are the top ways mice transmit harmful viruses and bacteria to humans. It is important to clean up mouse droppings immediately and take precautions when dealing with them.

However, if you are determined to clear mouse droppings on your own, make sure you take the necessary precautions, like wearing gloves and using a disinfectant spray or cleaner. And most importantly, always ventilate the area well.

Lizard poop vs mouse poop or rat poop: A summary

Lizard poopMouse/Rat poop
ColorLight brownDark black that turns lighter
ShapeShorter and thickerLarger in size and tapered
PatternClusters of droppingsScattered droppings

The two main differentiators that you need to be aware of when trying to identify lizard poop vs. mouse poop are the color and shape, and pattern of the poop.

Lizard poop varies from mouse poop in color.

There are different ways to identify rodent droppings, one of which is by color. Lizard poop is typically a light brown, while mouse droppings start off as a dark black but change to a lighter tone over time.

Lizard poop is different in shape and pattern compared to mouse poop.

Mouse poop is generally shorter and thicker than rat poop. Additionally, mouse droppings will be in tight clusters, while rat droppings will be more scattered. Rat poop is typically larger in size and has a more tapered shape than mouse poop.

Why does lizard poop or feces have tips that are white in color?

Lizard feces have tips that are white.

The white tips on lizard poop or feces are their uric acid, a kind of nitrogenous waste. Uric acid is white in color, and this is what gives the tips of their droppings their distinctive appearance.

Mouse feces, on the other hand, convert into urea-containing ammonia and give off an offensive odor.

The uric acid in the white tip segment of a lizard poop is very acidic and can quickly corrode surfaces it comes into contact with. Therefore, don’t be surprised if you find some discoloration on the surface where you found the lizard poop!

How should you safely remove or dispose of lizard poop in your home?

Here are some simple methods to safely remove or dispose of lizard poop in your home. 

Scrub surfaces with a wet cloth or a toothbrush.

Removing lizard poop from your home is a relatively easy process. All you need to do is take a damp cloth and wipe off the surface. If it is hard and stuck, you can scrub it off a little bit, but be careful not to damage anything else in the process.

Use a garbage bag along with a dustpan and a broom to pick up the lizard poop.

In order to remove lizard poop safely from your home, you can use a scoop or a bag. If the poop is on hard surfaces such as walls or floors, you can use a broom and dustpan to clean it up.

Make sure to wear gloves when cleaning up any animal feces, and always wash your hands afterward.

Scrub utensils clean with dish soap.

Having lizard poop on your utensils is particularly dangerous. Therefore, wash the utensils under running water and remove all traces of poop.

Soap and water can be used to clean any remaining traces of feces off the utensils. If there is too much poop in a utensil, simply dispose of it in a secure garbage bag.

Regularly clean your pet lizard’s cage to keep it clear of poop.

In order to clean lizard poop from a pet lizard’s cage, take your reptile cage or tank and clean it with hot water and dish soap. Be sure to disinfect the area thoroughly afterward with a bleach solution.

If you are dealing with mouse poop, please follow these same steps but use caution when handling the mouse droppings as they may contain harmful bacteria.


Lizard poop vs. mouse poop is a simple topic because the differences between the two are very obvious. Not only do they differ in color, but also their shapes. Regardless of which pest poop you’re dealing with, it is important to take the necessary precautions and stay healthy!

About the author

A biotechnologist by profession and a passionate pest researcher. I have been one of those people who used to run away from cockroaches and rats due to their pesky features, but then we all get that turn in life when we have to face something.