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Species Page - Hyalophora gloveri
Hyalophora gloveri ->species page

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scientific name    Hyalophora gloveri    

common name     Glover's Silkmoth

Found in shrubby areas of the prairies and open jack pine forests in the boreal region.

Adults are active from mid May to late June, with most records from the 2nd and 3rd week of June.

In Alberta, this species is similar only to H. cecropia, from which it differs in being primarily a maroon colour, rather than black. H. cecropia also has a bright red band along the outer margin of the transverse white band, which is absent in H. gloveri. Royal Alberta Museum page

life history
The overwintering cocoons of Glover's Silkmoth can sometimes be found attached to the stems of shrubs and small trees, usually on or near the larval host plant. Adult moths are attracted to light, but are generally not active until midnight or later. These moths are active on nights when ambient air temperature often drops below 5°C, which few other species tolerate.

No conservation concerns, although rarely common, this species is widespread throughout the province

diet info
Preferred larval hostplants in AB include Silverberry (Elaeagnus commutata), Choke Cherry (Prunus virginiana) and willow (Salix spp.). Host plant choice depends on availability and habitat; in the boreal forest, larvae are found on Choke Cherry (D. Macaulay, pers. comm.). H. columbia columbia of eastern Canada feeds only on larch (Larix laricina), but H. gloveri rarely if ever uses this plant in nature. However, larvae do well on larch in captivity.

Hay River, N.W.T., south to Arizona, east to southwestern Manitoba.

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Comments (10)Add New Comment

Connie (2010-05-01)
We found one of these georgous moths in our carport we are in the BC interior Kamloops

April Hunt (2010-05-14)
I found one of these in my backyard, May 15,2010. I live in Ennismore, Ontario....just north of Peterborough. I have taken pictures. They are huge and beautiful. I think he''s a little out of his territory?

Sarah (2010-07-22)
I found one of the huge caterpillars here in Clarkston, Michigan just Tuesday (7/20/2010). Way out of his area according to this site. When I was a child I found one of these huge moths on a wood pole under a deck roof at the public swimming pool. It was gigantic! This would have been in the mid 80''s. I''ve never seen one since until now. The caterpillar was caught by my dog. Needless to say, she mortally wounded it by destroying its head. :( But there was the rest to identify it with. It looks just like those you have here on the site. What kind of trees do they eat. The only ones near by was a Mulberry and Box Elder.

Ken Laninga (2010-08-22)
We found TWO of these huge caterpillars about August 18, 2010, north of Spirit River, Alberta. Both are now cocoons and I wonder how we can "raise" them and hopefully produce MORE of them.

Dale McLaughlin (2011-08-14) (2011-08-14)
Just found a rather large caterpillar on my buffalo berry bush. Bezanson/Grande Prairie AB.

Kim Hartford (2014-02-12)
My husband found this gigantic beautiful moth crawling up the wall of the house on February 10, 2014 in Carmel Valley, CA.

Kelly Shannon (2014-06-01)
I found one at work today, attached to a screen on a portable garage,very nice looking moth. Peace River, Alberta

Renee Girard (2015-05-25)
I found 2 of these moths this morning by my shop. They were mating, took some pictures and a video with my phone. I have never seen anything like this before, would like to know which is male and female. They were seen in the MD of Smoky River near Girouxville Ab. May 25, 2015.

Traci (2017-02-24)
I have one that is camped out on the side of my garage in Bonsall, CA. It's been there two days. Glad to know it can tolerate cold as it's been chilly the last couple nights but I didn't want to disturb it. Weird that it's out in February tho (2-24-17). Might be a brutal summer if spring things are coming out already!

Clare Gordon (2017-06-17)
The students at Tatla Lake School in the Chilcotin area of BC enjoy watching these beautiful moths. They find them each year clinging to the side of the school many mornings in June. I just saw one today when I was walking home for lunch.

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Related Species Info
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References (4)
Specimen Info
There are 111 specimens of this species in the online database
Map Distribution
Adult Seasonal Distributioncreate a collection histogram with specimens
Specimen List (111)


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