13 Weird (but COMMON) Caterpillars in Saskatchewan (2024)

What kinds of caterpillars can you find in Saskatchewan?

Common Caterpillars in Saskatchewan

Caterpillars are some of the MOST fascinating insects in the world! It always amazes me that caterpillars eventually turn into butterflies or moths.

There are hundreds of different caterpillar species found in Saskatchewan!

Since it would be impossible to list them all in one article, I chose the 13 most interesting and common ones to share with you. 🙂


#1. Monarch Caterpillar

  • Danaus plexippus

Common Caterpillars species in Saskatchewan

Identifying Characteristics:

  • This famous caterpillar is plump with black, white, and yellow bands.
  • Its legs and pro-legs are pronounced, and each end of its body has spindly black tentacles.
  • The Monarch’s preferred host plant is milkweed.

Like the adult butterfly, the Monarch is one of the most well-recognized caterpillars in southern Saskatchewan!

Common Saskatchewan Caterpillars

Their distinctive stripes and tentacles make them look cartoonish. But this highly visible coloring sends a message to predators: Back Off!

Monarch Caterpillars are toxic to most animals, and at the very least, taste bad! This poison comes from their diet, which is almost entirely made up of milkweed. Toxins from the milkweed plant stay in the caterpillar, producing a bitter taste and poisonous effects.

If you have milkweed in your yard or nearby, your chance of finding Monarch Caterpillars is excellent! Honestly, there is nothing more fun than finding these colorful insects on our milkweed plants and getting to watch them transform into adults!


#2. Cabbageworm

  • Pieris rapae

Identifying Characteristics:

  • Coloring is light green with small yellow dots along the sides.
  • This species is small and relatively thin and appears velvety.
  • Cabbageworms’ host plants are Brassicas, including cabbage, kale, broccoli, and chard.

In Southern Saskatchewan, this species is often called the Imported Cabbageworm because it isn’t native to North America. It was introduced in shipments of cabbage and other brassica plants and soon became an invasive species.

Cabbageworms are considered agricultural pests and can do severe damage to crops to their host plants. Cabbage, brussels sprouts, broccoli, and cauliflower are all susceptible to damage. For a home gardener, the best way to deal with Cabbageworms is to prevent a large infestation. Plant covers, regular weeding, and varied plantings can all help with preventing this hungry invader!

One reason Cabbageworms are so damaging is that they are voracious eaters! They can easily skeletonize entire plants, eating everything but the toughest stems and midveins. Boring through heads of cabbage and making huge dents in broccoli are no problem for this Very Hungry Caterpillar!

Cabbageworms grow into Cabbage White Butterflies, which are one of the most abundant butterflies in Saskatchewan! If you see a white butterfly in the spring, chances are it’s a Cabbage White!


#3. Woolly Bear

  • Pyrrharctia isabella

Identifying Characteristics:

  • Coloring is black with a wide rusty-red band in the middle.
  • As its name suggests, the Woolly Bear caterpillar is covered in dense, coarse hairs.
  • Transform into Isabella Tiger Moths.
  • Woolly Bears are generalist feeders, meaning they will live on and eat nearly any plant!

As a kid, I can remember hearing tons of stories about Woolly Bear caterpillars – and the coolest part about them is that most of the stories are true! One myth you might have heard is that Woolly Bears can predict the type of winter we’ll have. Unfortunately, this one isn’t true. But there’s plenty of other interesting facts about this cute little caterpillar!

The most fascinating thing about Woolly Bears is the way they hibernate.

That’s to say, they don’t hibernate at all! Instead of burrowing or pupating to escape the cold, Woolly Bears allow themselves to freeze solid. They have a unique chemical in their blood that allows them to thaw out and continue in the spring as if nothing happened!

You may have heard that Woolly Bear Caterpillars are venomous, but this isn’t entirely true. Their hairs don’t contain any toxins or irritants, but some people are sensitive to the hairs and may get a slight rash if they touch one. It’s best to observe the species without touching them, just in case.

Woolly Bear Caterpillars and their adult-form, Isabella Tiger Moths, are found in incredibly varied climates, even the Arctic! Because they will eat almost anything, including herbs, tree leaves, and grasses, they can be found pretty much anywhere plants are growing. Look for them in groups near the base of plants.

Just don’t expect them to take over for your meteorologist! 🙂


#4. Viceroy Caterpillar

  • Limenitis archippus

Identifying Characteristics:

  • The coloring is mottled brown or green and white to resemble bird droppings.
  • Two dark-colored horns on the head and small spines on the body.
  • The chrysalis also resembles bird droppings hanging from a tree branch.
  • The preferred host plants of Viceroy Caterpillars are willow, poplar, and cottonwood trees.

Viceroy Caterpillars are one of the ugliest caterpillars in southern Saskatchewan!

This is by design; their lumpy, mottled appearance makes them look like bird droppings, warding off predators!

Interestingly, this isn’t the Viceroy’s only protection against predators. Viceroy Caterpillars eat plants that are rich in salicylic acid, which they store in their bodies. When predators try to eat them, they are rewarded with a strong, bitter flavor and an upset stomach. One taste and they learn to stay away!

Viceroy Caterpillars primarily live in open forests or fields, and they’re found across many different climates. Look for them during spring and summer, which is when the adults typically mate.

Interestingly, Viceroy and Monarch Caterpillars look almost identical.


#5. Large Maple Spanworm

  • Prochoerodes lineola

Identifying Characteristics:

  • Gray-brown coloring with small black spots scattered on the body. Often this species has a bark-like pattern.
  • Thin and stick-like with a knob on each end.
  • Large Maple Spanworms use a huge variety of plants and trees as hosts: birch, maple, cherry, apple, oak, poplar, walnut, and willow trees; geranium, soybean, blueberry, and currant plants; and grass.

This species has one of the best camouflages of any caterpillar in Saskatchewan!

Large Maple Spanworms look exactly like a bit of twig on a tree, even from up close! So, it’s hard to imagine any predator observant enough to try and eat one, which is precisely its goal.

Their camouflage is the only defense Maple Spanworms have because they aren’t poisonous. They’re a favorite snack for determined birds!

When they’re not imitating sticks, Large Maple Spanworms have an interesting way of getting around! They plant their front legs, arch their back in the air, and bring their back legs forward to meet their front. Then, they throw their front forward and repeat the whole process. They’re one of many caterpillars that move like this, earning them nicknames like inchworm, looper, or spanworm.

Large Maple Spanworm Moths are just as adept at camouflage as their larva – they look exactly like dead leaves clinging to a branch!


#6. Variegated Fritillary Caterpillar

  • Euptoieta claudia

Identifying Characteristics:

  • Stripes of black, red, and white run the length of the body.
  • Black branched spines stick out from each body segment in even rows.
  • Variegated Fritillaries will use any plant in the violet or alder family as a host plant. These include common blue violets, yellow alder, and pansies.

Variegated Fritillary Caterpillars share the same name as their adult-form butterflies. They eat ornamental plants like violets, pansies, and passionflower.

Look for these caterpillars in southern Saskatchewan in meadows, open lots, and fields.

The Variegated Fritillary’s chrysalis is the most beautiful of all the caterpillars in Saskatchewan. This protective shell is where the caterpillar transforms into the adult butterfly. Its pearly white color and shiny gold spikes make it look like an expensive jeweled pendant!

 


#7. White-Marked Tussock Caterpillar

  • Orgyia leucostigma

Identifying Characteristics:

  • Black and yellow stripes run the length of the body with a large red spot on the head.
  • Many tufts of hair-like spines.
  • White-Marked Tussock Caterpillars will use nearly any coniferous or deciduous tree as a host!

The White-Marked Tussock Caterpillar wins the prize for the most interesting haircut!

Tufts of spiky hair give this caterpillar the look of having antennae, a tail, and spiky sides. In addition, four white tufts look like paintbrushes sprouting from its back. Talk about a unique style! And it doesn’t stop there – on the adult White-Marked Tussock Moth, the Antennae themselves are covered in fur!

The hairs on the White-Marked Tussock Caterpillar and its relatives are called urticating hairs, meaning they can cause a rash. Although it may be annoying and itchy, the inflammation isn’t dangerous, and this species is not venomous.

White-Marked Tussock Caterpillars sometimes have population outbreaks, where a local population swells exponentially. When these outbreaks happen, it’s common for colonies of the caterpillars to eat all of the leaves off of a tree, severely damaging them. Fortunately, there are quite a few natural predators that aren’t bothered by its hairiness and they are able to feast!

Viral infections eventually stop many population outbreaks of White-Marked Tussock Caterpillars. Alphabaculovirus, which is a class of viruses that infect and kill many caterpillars, moths, and butterflies, is mostly to blame. Infections spread quickly through White-Marked Tussock Caterpillar populations because they live closely together on the same host plant. The virus causes rapid sickness and death among infected individuals.


#8. Cecropia Moth Caterpillar

  • Hyalophora cecropia

Identifying Characteristics:

  • The coloring of this species changes with each instar growth. Most commonly seen in late instar; green with yellow, blue, and red bumps topped with black spikes.
  • It has a large, fleshy body and very obvious leg appendages.
  • Cecropia Caterpillars prefer birch, cherry, and maple trees for host plants.

Cecropia Caterpillars look more like aliens than anything!

Their bulbous bodies and multicolored, spiked nodules truly look like something from a sci-fi movie.

Look for Cecropia Caterpillars on maple, birch, and apple trees during late spring. They remain in their caterpillar stage for about two weeks before encasing themselves in their chrysalis for winter.

This species is one of many caterpillars in Saskatchewan called a “silkworm”. The name refers to the silk cocoon they spin around their chrysalis in preparation to become a moth. The cocoons are brown and cling to the side of host plants, and look like dead leaves.

As strange as Cecropia Caterpillars look, it’s nothing compared to the adult Cecropia Moth. Not only is the pattern and coloring beautiful, but this moth is also ENORMOUS! In fact, it’s the largest moth in North America!


#9. Large Yellow Underwing

  • Noctua pronuba

You’re most likely to find these caterpillars in Saskatchewan in open or shrubby areas, but they are habitat generalists that can adapt to various conditions. For example, they’re happy in urban and suburban areas, fields, agricultural areas, yards, and parks.

The adult moths are mostly nocturnal and are attracted to outdoor lights. You may occasionally spot large groups of them around bright lights.

Large Yellow Underwings might not have the most creative name, but it’s certainly accurate! At rest, their brown forewings usually cover their brightly colored hindwings, but you’ll see a flash of color when they take off! This flash helps to confuse and startle would-be predators.

Large Yellow Underwings have a longer lifespan than many other moth species. In captivity, males live an average of 55 days, and females live about 75 days. Despite their long lifespan, they only have one new generation per year.


#10. Painted Lady

  • Vanessa cardui
Vanessa cardui. (2023, August 10). In Wikipedia.
  • The caterpillars’ coloring is variable, ranging from greenish-yellow to charcoal. Most have light-colored spots.

Look for Painted Lady caterpillars in Saskatchewan in open areas that are quiet and undisturbed, like roadsides, pastures, and gardens.

The population of Painted Lady’s can drastically differ from year to year. It’s common for them not to be seen for years in some places, then suddenly show up in significant numbers.

The Painted Lady is the only butterfly that mates year-round! Because of its constant migration pattern, it spends its entire life in suitable areas for its eggs to hatch.


#11. Red Admiral

  • Vanessa atalanta

  • The caterpillars are pinkish-gray to charcoal with white spots. They have spines along the back that resemble hairs.

Look for this caterpillar in Saskatchewan near the edge of forests in moist habitats.

Red Admiral Butterflies have a unique favorite food – they love fermented fruit! If you’d like to attract them, try placing overripe cut fruit in a sunny spot in your yard.

Red Admirals are migratory butterflies. They fly south toward warmer climates in winter and then move north again in late spring when food is more plentiful.

If you’re looking for a butterfly that’s easy to observe, you’re in luck! Red Admirals are very calm and easy to approach and frequently land on humans!


#12. Pearl Crescent

  • Phyciodes tharos

  • Caterpillars are dark brown with cream stripes and spines all over their bodies.

The Pearl Crescent caterpillar’s preferred host plant is the Aster. Any flowering plants in your yard will attract this beautiful butterfly, but for best results, try to find one native to your area.

Look for Pearl Crescent butterflies in Saskatchewan near moist ground.

They prefer open, sunny habitats, but many locations suit their needs, including forest edges, fields, meadows, and gardens.

When the caterpillars grow into butterflies, they will feed on the nectar of the Asters as well!


#13. Mourning Cloak

  • Nymphalis Antiopa

  • Caterpillars are black with white specks and a row of red spots on the back.

Mourning Cloak caterpillars are most often found near deciduous forests. However, their habitat includes many developed areas like suburban yards, parks, and golf courses.

You might have a hard time finding this caterpillar in Saskatchewan.

Even though it’s fairly widespread, its preference for cold weather and solitary habits make it hard to spot, even for avid butterfly enthusiasts!butterflies in the united states

Mourning Cloaks are often the first butterflies to become active in the spring! In fact, some adults are even active through winter on warm days when snow is still on the ground.

They’re also one of the longest-lived butterflies, with some individuals living up to ten months!


Do you need more help identifying caterpillars in Saskatchewan?

Here are some recommended books on Amazon!


Which of these caterpillars have you seen in Saskatchewan?

Leave a comment below!


If you enjoy this article, make sure to check out these other guides!

Leave a Reply

Your email address will not be published. Required fields are marked *