The Lifecycle of the Mourning Cloak Caterpillar to a Butterfly
The Mourning Cloak Butterfly
My kids and I love to search for butterflies, or more specifically the eggs and caterpillars, so that we can "raise" them and watch the amazing transformations. True, you can just buy a kit, but we find something very satisfying about finding them ourselves, not to mention that you learn so much more—like where and when to find them, as well as what their natural behaviors might be. I'd like to share some of these observations so that maybe you or your kids might enjoy and learn as well.
The Mourning Cloak Butterfly
The mourning cloak or Species: Antiopa (Family: Brushfoot, Sub-fam: Nymphalinae, Genius: Nymphalis) has one of the longest lifespans of all butterflies, as it estivates (a period of dormancy during the summer) and also hibernates all winter in the adult phase. This is uncommon for butterflies. Most overwinter as an egg or pupa (such as the Swallowtails) or they migrate as adults (like the Monarch.) Just imagine this seemingly fragile creature surviving temperatures of -35°F and colder while just huddled in the crack of a tree branch!
The Butterfly Life Cycle
Often, adults spotted in the spring will have tattered wings from their long winter experience. In the early spring, the adults will emerge to mate and lay eggs. The females will lay the eggs on the caterpillers' favorite host plants: Willow, Aspen and Cottonwood.
It's really fun, especially with kids, to find the females laying eggs on these host plants; look in moist areas such as river valleys or wet meadows. Don't look too early in the season because the females may not have mated yet. Wait until the leaves on the host trees are mature.
You can tell a female from a male usually by the way they are acting. The females are shy and less active than the males. The males are more aggressive and may be "hassling" the females. Also if a butterfly is "puddling," or drinking from shallow puddles, this is almost always a male.
The female will usually lay clutches of eggs at the base of a tree branch. To collect the eggs, you can use a small paintbrush and brush them into a Tupperware container with a lid (and a few small holes for air.)
Raising the Hungry Caterpillar
As soon as they hatch, move them with your paintbrush (they will be very tiny) to a cut branch of the host plant. Keep the cut end of the branch in a bottle of water and wrap foil or plastic-wrap around the neck of the bottle so that the caterpillars can't get into the water and drown.
I keep the whole thing, plant, bottle, caterpillar and all, in an old aquarium. You could also use a screened cage or even make a container out of a net or nylon. Then again, there are some great websites where a can be purchased for relatively inexpensively. pop-up enclosure
Your tiny caterpillar is in it's first stage or "instar" and is not likely to try to go anywhere. They just eat and grow and make "frass" (caterpillar poo) and then eat some more.
The mourning cloak, like most caterpillars, has 5 stages or "instars," growing bigger and shedding their outer skin with each one. The entire larval stage is about 2-3 weeks (depending on the weather and food availability.)
If you miss the chance to collect them as eggs, then just look for the caterpillars. When the eggs hatch, the caterpillars will stay together in groups feeding on the favorite host plants (Willow, Aspen and Cottonwood) until they are close to pupating. (Because of this "social" behavior, people often confuse them with the larva of Gypsy moths or Tent worms which are fuzzy with red spots and cluster together similarly.)
When they have reached the fifth and final instar, they set out individually in search of a good location to make their chrysalis.
Mourning Cloak Caterpillar
The Caterpillar Pupates
Just FYI, if you find a caterpillar crawling on anything other than its host plant -- your house, the driveway, the sidewalk, etc. -- chances are good that it is in ,what I call "the wandering stage." Most caterpillars do this just before pupating. (They are otherwise fairly sedentary creatures.) They will suddenly become very active and, if you have them at home, they will make trip after trip around the inside of their enclosure. Once they have started this behavior, they will usually pupate within 24-48 hours.
They need a safe place where they can hang upside-down. They will assume what I call the "prayer position," which looks like this:
Don't miss the Metamorphasis...
The caterpillars will hang from a stick or even just the top of a jar. I usually move them into a glass jar (like a mason or canning jar) and cover the jar with a paper towel. Then I secure it with a rubber band. They almost always choose the paper to hang from. Don't worry about trying to feed them in this stage, they won't eat.
Try not to disturb them once they are "praying." But, if at all possible, don't miss the actual transformation. It only takes a minute or two and is incredible. If you notice them sort of pulsing, it's going to happen soon!
The Mourning Cloak Chrysalis
The Beautiful Butterfly Emerges
In early August (in Montana), the mourning cloak caterpillars will pupate. If you have given yours a stick or paper to hang from, then it's easy to move them back into the larger container after the chrysalis has had several hours to harden. Maybe even wait a day or so -- you have plenty of time. Then, just pin the paper or stick to the inside of the enclosure.
It is important that they have plenty of room when they "eclose" or emerge. If they are crowded, the result will be misshapen wings. After 10-14 days, the beautiful adult will emerge.
Hopefully, you will get to witness this wonder! A crumpled damp adult will pull itself out of the chrysalis shell and begin to pump its wings, bigger and bigger, until they are fully formed, then they will dry.
Don't be alarmed if your butterfly has some bright red or orange discharge; it is not bleeding. It is just the left over pigment they don't need.
The Adult Mourning Cloak Butterfly
The underside of the mourning cloak's wings are brown with a cream colored band along the irregular edges. The tops of the wings are more colorful with yellow, blue and purple.
Adult mourning cloak butterflies have some strange eating habits. They enjoy rotten fruit, tree sap, and even animal droppings.
The mourning cloak is the Montana State butterfly.