Home >> Butterflies >> Why Do Butterflies Have Straw Like Mouthparts?

Why Do Butterflies Have Straw Like Mouthparts?

Written By Sara Sabharwal


Why Do Butterflies Have Straw Like Mouthparts

Butterflies are unique and interesting creatures. Not only do they go through dramatic changes in their life cycle but they also have body parts that are specially designed to help them survive.

One of these adaptations is their straw-like mouthparts. But, why do butterflies have straw like mouthparts? Why were they developed in this way?

The straw like mouthparts are incredibly helpful for butterflies to be able to easily access nectar deep within flowers.

Nectar is the main food source for butterflies. In fact, if you are hoping to increase the number of butterflies in your garden this year, pay attention to the types of flowers you grow.

Colour plays a large role in attracting butterflies. They love purple, blue, yellow, and white flowers. What may play an even bigger role in attracting and keeping butterflies in your garden is the shape of the flowers. 

Choosing flowers that are large and flat allows butterflies and other pollinators easy access to the nectar and pollen. Butterflies can use their proboscis, or mouth, to easily get to the nectar in tubular-shaped flowers as well.

Want to Attract Butterflies to Your Garden?

We’ve Put Together an Ultimate Guide to Attracting Butterflies to Your Garden Including Our Top 11 Plants You NEED to Start Growing Today:

How Do Butterflies Use Their Proboscis? 

The proboscis of a butterfly is an interesting and unusual mouthpiece that is fascinating to learn about. If you have ever seen an adult butterfly up close, you have probably noticed a circular shape on their heads near where their mouth would be.

This is their proboscis.

It acts as a tongue and straw in one to help the butterfly slurp up all the delicious nectar from flowers. Nectar is the main food source for adult butterflies. While they can source nectar from other food sources like fruit, vegetables, or herbs, nectar from flowers is the most vital source for butterflies.

Is a Butterfly Proboscis a Straw?

Yes, a butterfly proboscis is essentially a straw that they can extend and retract into flowers to suck up nectar. Butterflies have a liquid diet and, therefore, have no requirements for a normal mouth as they have when they are larvae.

Unfortunately, butterflies without a functioning proboscis will die as they won’t be able to feed themselves.

When a butterfly emerges from their cocoon, its proboscis is not fully formed. In fact, it is actually split in two!

When the butterfly has made its way out of the cocoon fully, you will see the butterfly extend and retract its proboscis multiple times until it “zips” together and forms one piece.

A few species of butterflies have an even more unique proboscis as theirs has been adapted to allow the butterfly to eat pollen! Pollen provides additional amino acids that regular nectar lacks.

Amino acids are the building blocks of protein. The butterflies that have this ability tend to live longer than the species that cannot eat pollen. 

Do Butterflies Have Mouths?

Adult butterflies live entirely on a liquid diet. Because they do not eat anything solid, nor need it to survive, butterflies do not need teeth or mouths like other animals.

Their proboscis is a straw-like organ that allows butterflies to drink nectar from flowers and water for hydration. Butterflies, and even moths, use their proboscis as their mouths and do not have a traditional mouth. 

While it may seem weird that these creatures do not have a mouth, it makes sense for butterflies at this stage.

Butterflies in the larvae and caterpillar stages do have mouths and will feed on plants and leaves. However, once they go into their cocoons and emerge as adult butterflies, they have no need for a mouth as they live on a liquid diet.

Another fun fact about adult butterflies is that they do not need to defecate or urinate as they do not consume any solid food.

They can, however, spray water from their abdomen if they have consumed too much. This liquid is not urine but instead excess water. 

Do Butterflies Have Tongues?

No, butterflies do not have a tongue per se. Instead, they have a proboscis which acts as their mouth and their tongue to suck up nectar from plants.


If you find yourself asking why do butterflies have straw like mouthparts then hopefully you now know. Butterflies use their proboscis as their mouths. This unique organ is long and is kept rolled up on the face of the butterfly.

While this organ is not their mouth, it is the way that adult butterflies feed themselves.

They use their proboscis as a straw to slurp nectar out of flowers while feeding. Adult butterflies eat and consume a liquid diet, rather than eating solid particles.

However, some butterflies have adapted and can eat pollen. Pollen is full of amino acids. Butterflies with this adaptation tend to live longer than butterflies that do not have the ability to eat pollen. 

Butterflies have many unique features that allow them to thrive as pollinators. However, the proboscis may be the most effective and efficient. The length allows butterflies to really get into flowers’ nectar even when the shape of the flower is not ideal.

Butterflies will choose large flat flowers for ease, but tubular-shaped flowers are also easily accessible thanks to the butterfly’s proboscis. 

Leave a Comment