Even though August is here now and I have started checking the river for early migrants and birds that are now undergoing post-breeding dispersal, I am still devoting most of my attention to insects. I usually do my birdwatching first thing in the morning while waiting for the bugs to become active, though it has been so hot lately that there are usually some butterflies and dragonflies flying early in the day.
I started my morning today with a walk to the dyke at Shirley’s Bay. In the parking lot I found a pair of House Wrens (one adult and one juvenile) foraging in the trees right behind where I had parked, and a juvenile Common Grackle feeding on the berries.
The grackle was so cooperative that I took several photos before gathering up my spotting scope and walking over to the dyke. This is the first time I’ve seen such a cooperative juvenile grackle outside of my backyard, where the parents bring their fledglings to my feeder. I’ve never seen them feed on berries out in the open, so watching this young bird was quite a treat.
This time of year, before songbird or waterfowl migration has started, I prefer to walk along Shirley Boulevard to the DND gate (calling for permission first) and then inside the fence line to the trail through the woods. The mowed area along the fence line provides good edge habitat and lets in the sunshine, which makes it a great spot to see some interesting bugs. Usually there are darners here in the latter half of the summer; I spotted a Canada Darner which landed briefly on a sign attached to the fence. I also spotted several meadowhawks and one male Eastern Pondhawk, and heard a Gray Catbird calling from somewhere within the thickets. I turned the corner and entered the shady side trail, not noticing the Giant Swallowtail sitting in a patch of sunlight until I startled it into flight. It flew right past me, turned the corner and landed on another sunny leaf. I followed and took some photos; these butterflies can be difficult to photograph as they rarely sit still when feeding. I think this one was basking in the sunlight while it waited for it to warm up. The Giant Swallowtail is a relatively new species in our area, and the largest butterfly we have.
The Giant Swallowtail was first seen in eastern Ontario in 2011, and good numbers continued to be observed in Ottawa the following year in places like Shirley’s Bay where Prickly Ash – one of its larval foodplants – is common. Since then it has managed to breed successfully in our area despite some unusually cold and prolonged winters, becoming a new addition to the Ottawa fauna.
I headed back into the woods to make my way to the dyke. There was a large mucky puddle in the middle of the path, and I noticed a few birds flying down to it and back up. I set up my scope and watched, expecting to see some robins – for some reason the puddles on the trail are a magnet for thrushes, and it’s too early for Swainson’s Thrush and Hermit Thrush to have arrived yet. There was one robin, yes, but the other two large birds were both Northern Flickers. There were also some smaller birds bathing in the puddle and walking around the edge; the bathing birds turned out to be a pair of Black-and-white Warblers, while the other birds turned out to be a female American Redstart, two Northern Waterthrushes, and a Song Sparrow! This was the highlight of my walk, for when I got to the dyke I didn’t see many birds on the mudflats when I arrived.
A Great Egret was preening on the sandy spot closest to the woods near some geese, and I spotted some Wood Ducks against the grassy spit.
A Northern Harrier flew in while I was watching and worked its way down the spit, while several swallows hunted overhead. I saw a Northern Shoveler and a Green-winged Teal, both females, feeding together in the middle of the bay, and a large group ducks gathered together at the end. There were three male Redheads among them, all in various stages of molt, with enough of a red head to identify them. On the sand a group of Lesser Yellowlegs foraged with a single Spotted Sandpiper. If there were any other shorebirds among them I couldn’t see them. I also managed to see an adult Sora when it briefly stepped out onto the sand from the tall reeds before quickly darting back into the vegetation.
I took the woodland trail back to the parking lot, seeing the Black-and-white Warblers and one of the waterthrushes on the ground again on my way back. This time the waterthrush was picking up leaves and checking the ground underneath. I heard a couple of Eastern Wood-pewees singing and watched as a doe crossed the path with her fawn and disappeared toward the creek. At the fence line I heard a pewee singing close by and was surprised to see it right on the fence.
I also saw two more darners in this area; one landed briefly on my shirt before flying up into a tree, while the Canada Darner landed close enough to identify but too far overhead to photograph properly. The male Eastern Pondhawk was still hunting in the same area, and I got a better photograph of him hanging from a blade of grass.
By then I was in the mood to take my net and go dragon-hunting. I decided to head over to the Bruce Pit to look for spreadwings there; up to six species breed there, and I usually see a good variety on any visit. Unfortunately the cattails have completely taken over the southwestern corner of the pond where Chris and I used to find the Amber-winged Spreadwings and Saffron-winged Meadowhawks; although a couple of Common Gallinules squeaked at me from the depths of the cattails, their presence doesn’t quite make up for the disappearance of the odes that used to be found here.
There were some large odes flying over the pond and the western edge of the water, including many mosaic darners. I waited a long time for one to pass close enough by my net to catch, but despite several attempts all of them eluded the net. A few teneral Common Green Darners were present; I found them by scaring them up from the vegetation and watching to see where they would land.
One Common Whitetail and several Twelve-spotted Skimmers were also busy patrolling the area.
Eventually I found several spreadwings on the west side of the pond just to the left of where the path from the hill emerges. I caught and identified a couple of Lyre-tipped Spreadwings, one Northern Spreadwing, and one Sweetflag Spreadwing.
It would have been nice to have seen the Northern and the Sweetflag Spreadwings together. Unfortunately it did not occur to me to photograph their claspers as this would have have made a nice comparison. However, the photos that I took of the male Sweetflag and the male Lyre-tipped Spreadwings nicely shows their different appearances. The Lyre-tipped Spreadwing has blue eyes that are deeper in colour and also some stripes on the thorax. In contrast, the Northern and Sweetflag Spreadwings usually develop more pruinosity and appear whitish-blue in colour.
The other spreadwing that I photographed was a Slender Spreadwing – I didn’t need to catch it in order to identify it. It is closer to the Lyre-tipped Spreadwing in appearance but has a much longer abdomen.
I headed over to the north side of the pond where I found couple of butterflies – a White Admiral and what was probably a Mourning Cloak were both obtaining moisture from the ground. The Mourning Cloak flew up and vanished before I realized it was there, but the White Admiral didn’t fly too far.
I didn’t see as many odes on the open north side so I turned around and went back to the south side. I pushed my way past a couple of fallen trees and found a small opening onto the pond. I saw a Belted Whiteface and spent some time photographing it. As I did, a large darner came along and started ovipositing on the reeds lying in the water. It saw the handle of my net lying on the ground and attempted to insert some eggs into that, too, before realizing it wasn’t a suitable substrate!
The Belted Whiteface was cooperative, and I managed to get a close-up photograph of the wings. You can see the forewing triangle here and the three rows of cells to its right. Frosted Whitefaces only have two rows of cells. This is a neat identification feature, and one that I hope to look at more closely next year.
It was a great day for bug-watching, and I’m glad I was able to see the Giant Swallowtail at Shirley’s Bay and so many different dragonflies and damselflies at Bruce Pit. The beginning of August is bittersweet for me, for it means that the flight season for many different insects is already over for the year and summer is continuing its relentless march toward fall. Although I will have to wait another year to see the bugs I missed this season, there are still at least two months of warm weather left to look for butterflies and dragonflies before bird migration takes up my attention once again.