This time of the year our feeders and flowers are a buzz with hummingbirds, but did you know there may be an interloper hiding in plain sight!
Yup, one of the most delightful insect visitors to your garden is the hummingbird moth. Several species of the genus Hemaris deserve this name and for very good reason. They fly and move just like hummingbirds. Like them, they can remain suspended in the air in front of a flower while they unfurl their long tongues and insert them in flowers to sip their nectar. They even emit an audible hum like hummingbirds. Quite often inexperienced gardeners notice what they think is a tiny hummingbird fleeting among flowers such as bee balm (Monarda). They are amazed when they find out what they saw was not a bird but a moth.
Hummingbird moths are rather plump and the tip of their tail opens into a fan. They are usually of a rich reddish or yellowish brown color, at least in part. Like all Lepidoptera (moths & butterflies) their wings are covered by scales. Some species lose many of the scales from patches on their wings, so they are called clearwing hummingbird moths. Like most moths they have a very long tongue which they carry rolled under their chins and use to reach the nectar of long-necked flowers. Such nectar is inaccessible to many other flower visitors, so it seems these flowers prefer long tongued pollinators and try to keep the others away.
These day-flying moths are can be found in the gardens across North America. In the Old World, there are several species of hummingbird moths. Some of these species are closely related and all belong to the same genus, Hemaris. The British prefer to call them Bee Hawk-Moths since there are no hummingbirds in the Old World. There are four species of hummingbird moths in North America. The most familiar ones are the Snowberry Clearwing (Hemaris diffinis) and the Hummingbird Clearwing (Hemaris thysbe). They are both fairly common in the Carolinas.
Like the majority of moths and butterflies, the adult hummingbird moths feed on nectar from a variety of flowers, but their larvae need more specific food plants, such as several species of honeysuckle, dogbane, or some members of the rose family such as hawthorn, cherries, and plums.
The adults may start flying in early spring, when the bluebells (Mertensia) are still blooming; but you will have a better chance to see them when they are most active, in the summer when the bee balms are in bloom. If you have phlox (Phlox), beebalm (Monarda), honeysuckle (Lonicera) or verbena (Verbena) you are also likely to see these wonderful insects visiting these flowers. Recently (August), I’ve been seeing one almost daily on a butterbly bush with a juvenile hummingbird.
The females entice the males with an aroma or pheromone that they produce from glands at the tip of the abdomen. After mating, they lay their tiny, round, green eggs on their larval food plants, usually on the underside of the leaves. The caterpillars have a horn at the rear end and are commonly green. They are well camouflaged among the leaves. When they are fully-grown they drop to the ground, spin a loose cocoon and pupate, partially
protected by leaf litter. That leaf litter so hated by some gardeners provides a shelter to this beautiful pollinator, so here is another reason to leave the leaves!. In the north, where the season is short there is only one generation per year; the pupa spends the whole winter well hidden and the adult does not emerge until the next spring. In the south, there is usually more than one generation each summer.
So keep a look out for these amazing little creatures buzzing through your garden. They are fascinating to watch. (Adapted by Judy Walker, from Hummingbird Moth by Beatriz Moisset, U.S, Forest Service https://www.fs.usda.gov/wildflowers/pollinators/pollinator-of-the-month/hummingbird_moth.shtml )