This morning 12 of us gathered at the Bartlett Shelter to kick off a bird walk in Schenley Park. The weather was very gray and cloudy, almost foggy, and we worked hard for every bird for more an hour and a half.
Then the sun came out at 10am and so did the birds. Our best sightings were in the last 15 minutes. We ran overtime to see them!
Fall officially arrived this week though it’s been in progress for a while. Trees and plants are gradually losing leaves, squirrels are storing food for the winter and birds are migrating. It’s a good time to be outdoors.
We’re sure to see birds, lingering flowers, fruits and acorns. Acorns are a big attraction for chipmunks and blue jays. Last week the number of blue jays exploded when migrating jays arrived in town. Will there be more blue jays than chipmunks? Come and see.
Dress for the weather and wear comfortable walking shoes. Bring binoculars and field guides if you have them. NOTE that a fallen tree blocks part of the Falloon Trail trail so we’ll have to go off the beaten path. Be prepared to walk on dirt with roots and rocks. A walking stick may be useful.
Visit my Events page before you come in case of changes or cancellations.
(photo credits: blue jay by Chuck Tague, chipmunk by Brian Herman)
One advantage of botanizing the same place over and over again is that you get to know what grows where. You remember a plant that draws attention in the spring, forget it in the summer when it’s boring, then notice it again in fall. Because it’s in the same location, you know what it is.
The identity of this dangling blue fruit was a puzzle until I remembered that it’s hanging from the fringetree that put on a floral show in May.
A long slender beak-shaped mouth part (proboscis) for sucking liquid food.
A partially hardened pair of front wings with clear tips and completely clear rear wings shorter than the front ones.
Few joints in the antennae and feet: antennae about five joints, feet usually no more than three.
Cicadas have these characteristics so they and 50,000 to 80,000 other insects are in the “true bug” Order Hempitera. This tiny green flatid planthopper is too.
But their status is more complicated. These two are true bugs but not true “True Bugs.”
Within Hempitera there’s a suborder of really True Bugs called Heteroptera. Cicadas, planthoppers, spittlebugs, aphids, and adelgids aren’t in this suborder. (See taxonomic chart from bugguide.net below.)
White-tailed deer are numerous and very tame in Schenley Park. Last week I encountered a doe with twin fawns near the swimming pool.
The family became alert while I was staring at them, but the mother has learned that we humans aren’t dangerous and is teaching it to her kids. How many generations does it take for the herd to become this tame?
In the past ten years I’ve seen the landscape change in Schenley Park while the deer population has grown exponentially. Where there used to be thick slopes of false Solomon’s seal and yellow jewelweed there is nothing green now, just carpets of fallen leaves. Having eaten the good stuff they are working on less tasty food, avoiding the poisonous plants such as white snakeroot at their feet in these photos. Some day their range will fail them.
I now suspect that just as a deer herd lives in mortal fear of its wolves, so does a mountain live in mortal fear of its deer. And perhaps with better cause, for while a buck pulled down by wolves can be replaced in two or three years, a range pulled down by too many deer may fail of replacement in as many decades.
The house in the video above was inside a landslide zone on Semicir Street overlooking Riverview Park. Add water and … the house collapsed!
The bedrock at fault is Pittsburgh redbed, a claystone that disintegrates into smaller and smaller pieces if exposed to pressure when it’s wet. Redbed is usually under pressure because it’s underneath solid rock and overlying soil. Add water to a steep slope and you have a landslide.
This sandstone boulder on the Bridle Trail in Schenley Park was part of the escarpment above it until the redbed layer beneath it gave way.
Here’s a future landslide on the Lower Panther Hollow Trail. This sandstone boulder, high above my head, will fall some day because the slow drip of water over the boulder has disintegrated the underlying redbed. Notice the reddish crumbled stones.
I had read that Pittsburgh redbed disintegrates when wet but I wanted to see for myself so I gathered some redbed rocks and ran an experiment.
Thousands of years ago these small crumbles were a much bigger solid rock but water had already acted on them. Will the crumbles disintegrate in the presence of water and pressure? I kept some rocks dry and soaked others for a day. Here’s my experiment.
Add water and pressure to Pittsburgh redbed claystone and … Watch out below!
Join me on Sunday, July 28 at 8:30am for a bird and nature walk in Schenley Park.
On this month’s outing we’ll visit a trail I’ve never shown you before. Meet me at the start of the Bridle Trail, so named because it was built in the late 1880s as a riding path for horses. We’ll make a clockwise circle for 1.6 miles.
The gravel trail is a gentle downhill with rock outcrops, a view of the Monongahela River, two stone bridges, and some cool birds and plants. American hophornbeam winged fruits, shown above, are seen along the way.
Dress for the weather (probably hot!). Wear comfortable walking shoes and bring water, a sunhat, binoculars and field guides if you have them.
p.s. What goes downhill must come up the woodland staircase to the Oval.
I found a ghost flower blooming in Schenley Park last Monday.
Indian pipe (Monotropa uniflora) looks ghostly because it has no chlorophyll. Instead it’s symbiotic or parasitic on fungi that have a symbiotic/parasitic relationship with tree roots. This makes Indian pipe a parasite on a parasite … sort of.
Though it’s a perennial member of the Heath family, Indian pipe only grows when conditions are perfect and these are so impossible to replicate that the plant isn’t cultivated.