adventures in nature

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hawk hill today / juv peregrine shenanigans!

Exciting day at Hawk Hill today by the Golden Gate Bridge, one of the great spots for seeing large numbers of migrating raptors. The Accipiters are coming through in high volume right now, and I was able to get out for a bit to watch. The fog started to roll in just as I got there, but we still had a good number of birds coming through (and visible, despite the low fog bank).

In addition to many sharp-shinned hawks and a few cooper’s hawks, we were treated to a few peregrine falcons that flew by. But not only did the juvenile peregrine fly by – it stayed a while to perform some antagonizing aerials on resident ravens, migrating sharp-shinned hawks, and one lone harrier! It’s hard to tell if it was hunting, just playing, or something in between. The ravens seemed to be having fun playing with it. The small sharpies … definitely not so much!

juvenile peregrine falcon "playing" with two ravens / Hawk Hill GGRO Marin Headlands CA

juvenile peregrine falcon “playing” with two ravens / Hawk Hill GGRO Marin Headlands CA

juvenile peregrine falcon and raven

juvenile peregrine falcon and raven

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juvenile peregrine falcon / Hawk Hill GGRO Marin Headlands CA

juvenile peregrine falcon / Hawk Hill GGRO Marin Headlands CA

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turkey vulture

turkey vulture / Hawk Hill GGRO Marin Headlands CA

juvenile sharp-shinned hawk / Hawk Hill GGRO Marin Headlands CA

sharp-shinned hawk / Hawk Hill GGRO Marin Headlands CA

juvenile sharp-shinned hawk / Hawk Hill GGRO Marin Headlands CA

juvenile sharp-shinned hawk / Hawk Hill GGRO Marin Headlands CA

an evening in a great-horned owl’s dining room

One of the areas that I spend a lot of time is absolutely saturated with great-horned owls. And coyotes, for that matter. I would conservatively estimate that within one area of about two miles by a half mile (as observed routinely for the past year), there are five or six pairs of great-horned owls that make their home there. I routinely hear them and see them, and it has become one of my great pleasures to spend time watching them. My sentiment is likely not the same for many other animals in the area, including skunks, gophers, voles, mice, screech owls, barn owls, domestic cats, and any other animal under 20 pounds that makes its living at night, whether by foot or by wing. And actually, young red-tailed hawks too, are at risk – three of which, I suspect, from a nearby nest this season, met their doom by owl talon.

Last night after a nice run, I decided to extend my stay in the park with a wander up around some of the more remote areas (“remote” being a very relative term in the Bay Area! Yet, still surprisingly true to the word … one of the reasons that this area is able to be inhabited by feral Zachs). I started off flowing over some cattle trails, also used by deer and coyotes and turkeys, until I got to some small wooded canyons. I have a number of ways to cross most of them, as they are densely wooded and steep in sections, but sometimes depending on the amount of light it can get confusing. Especially when I get distracted by things – which I inevitably do. As I ducked down under the boughs of the bay laurel trees standing guard at the edge of the first ravine, I almost immediately saw some feathers that I hadn’t seen the night before.

Owl feathers.

Small ones. They looked like they were from a Western Screech Owl, one of the smaller owls that inhabit this area. It’s seldom that I hear them in this area, and if I do, it’s usually further down slope towards the more densely wooded areas. With so many great-horned owls around, they don’t make it long if they leave the safety of those areas. Such was the fate of this one who perhaps flew to far up into the more open oak woodlands and grazing lands.

As my eyes adjusted to the dim light under the oaks and bay laurels, I started seeing more and more feathers. This was no molt, for sure. This small owl was predated. And judging by the feathers, it was taken by another bird. Almost certainly a great-horned owl. Owl on owl! Great-horned owls are a top tier predator, and they are incredibly successful and adaptive hunters. Hide your babies (that’s a joke).

As a side-note, the previous night when I had passed through the same area, there was a very intense smell of skunk spray right where I was seeing the owl feathers. I didn’t spend a lot of time looking around then, but I noted it. This night, the smell was still very strong. As I followed the trail of owl feathers like bread crumbs to the ginger bread house, the skunk smell got stronger. Strange.

Finally I got to a spot where it appeared the great-horned owl had plucked a majority of the feathers from the screech owl. The skunk smell was almost unbearable, as if it had just let go nearby recently. Yet I knew it was at least 24 hours old. As my eyes found a more concentrated area of feathers, I walked over to check them out. And right by the feathers I found a skull! It looked like a young skunk skull!

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I kept looking around in the leaves, and soon I found one of the biggest great-horned owl pellets that I’d ever seen! It looked like majority skunk hair (dissecting to occur soon) …

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An owl not only ate that when it was also flesh, but puked that pellet up!! Amazing.

Above me was a slight clearing in the canopy, and covering some of the stars, silhouetted in the twilight, was an old dead oak tree. The perfect perch for an owl. As I looked around more, there was a lot of owl slice (owl poop), and other remnants of dead things. I think I had stumbled on a great-horned owl’s dining room!

It was well past dark at this point, so I decided to move on. I went through another canyon, in which the night before I had heard a great-horned owl – but tonight I heard nothing. I kept walking, and soon I got to a tree line that was just on one side of a clearing, of which on the other side, was the perch of two of the local owls. As I walked past the last trees in this first tree line, I saw an owl. Interesting, it was in a spot I’d never seen one before.

I walked across the clearing / meadow, and got to the next tree line where the locals were, and sure enough there was the silhouette of another owl in an oak tree right by where I’d expect one. As I approached, the owl didn’t move. It didn’t even seem to notice me! Again, very strange. As I got closer, my path went right by it, but the owl hardly looked at me. It was intensely staring in the direction of the first owl that I saw. Suddenly I got a glimpse of another owl take off from nearby, flying away from the owl I was underneath. I walked right by the owl in the tree, probably at 25 feet, and the owl just continued to stare across the meadow at what I was now guessing to be a new owl intruder (the first owl sighted). I continued around this line of trees, and made my way towards the exit of the park.

About 500 meters later though, I felt something to my right and looked up and realized that the owl that I had seen take flight was now in a coyote bush just 15 feet from me. It also seemed unconcerned with my presence, and was looking back in the direction of the other owls.

I’m guessing that a new owl had moved into the area, and these two residents were ready to battle to keep it at bay. I’m not sure about the migration of owls, but certainly at this time of year hatch year owls could be dispersing trying to find territories of their own (though it actually seems early for that). Could this be a migrant from the north looking to overwinter? A second year bird that is looking for a territory? I need to do some research.

When I finally got home, about ten minutes later I realized I had to put my shoes outside because the skunk smell had gotten on them and it was really intense. It is said that great-horned owls have no sense of smell … so combined with their incredible power, it makes for one of the few predators of the striped skunk!

equinox, shifting patterns of autumn … and blog #200!

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 Sunset by Mount Tam over San Pablo Bay, as viewed from Wildcat Canyon Regional Park CA

What an amazing time of year this is – the shift from the summer cycles to autumn is in full effect. I love this time of year. The buckeye trees have long ago lost their leaves, the first harbingers of the impending autumn here – and the days are growing shorter as the light turns to a beautiful golden red. Here in the Bay Area, it means we actually have some summer weather! Infrequent wind, less fog, and some beautiful sunshine and warm weather … and warm nights. The long winter of summer is over, and all of life is shifting, moving … while still waiting for some rain. The bird migration is flowing south, the trickle of birds flowing in the updrafts of the coastal mountains now turning into more of a flood. The Accipiters were the predominant raptor today at Hawk Hill at the Marin Headlands, and in my backyard, and all around, I hear new birds adding their voices to the choir as they move through or come here to spend the winter moons.

juvenile Sharp-Shinned Hawk / Hawk Hill Marin Headlands, CA

juvenile Sharp-Shinned Hawk / Hawk Hill Marin Headlands, CA

The black-tailed mule deer bucks are chasing does, and more than a few willow trees are marred with the fresh marking of the bucks’ antlers. The smell of the new scarring on the trees is delicious. Ripe acorns are falling, and the acorn woodpeckers, squirrels and jays are busy adding to their own little collections. The poison oak is a beautiful red color (and hey, an extra warning to the careless one who treads without heed!), and the unusually still air in the evening makes space for the sound of crickets and all sorts of insect life.

You can hear life moving all around you in the hours after sunset in the absence of the wind.

As I walk, the smell of dry bay leaves follows my footfalls under the canopy of trees, while in the fields of introduced grasses that predominate the Bay Area, the sweet smell of tar weed dominates. They are two of the first smells I remember from when I moved to the area at this time of year nine years ago, and both bring with them nice memories.

deer rub on willow tree / Wildcat Canyon Regional Park CA

deer rub on willow tree / Wildcat Canyon Regional Park CA

Last night, the equinox, I had a great wander in Wildcat Canyon. Because of the lack of wind and extremely dry conditions, anything that is moving makes noise. Listen carefully enough, and you can start to discern the different animals by their footfalls and movements. I still am amazed at how quiet a deer can be even in these conditions though – an animal that big can be so silent. Sometimes I feel something watching me, and adjusting my eyes in the dark, I see one of them nearby staring at me. But sometimes it’s the other way around too! After many months of seeing mostly just bucks in the drier areas, I’m now seeing females make their way back after spending the dry months more in the human habitation areas (more food, more water, protection for their fawns aka less mountain lions!). During the rut they are less shy, and almost every night that I wander I see bucks and does interacting – and not as concerned about my presence.

As I was finishing my hike last night, I heard a very slight rustling in the oak trees to my left. I paused, and listened. The sound stopped. Hmmmm. Usually a skunk or raccoon will continue on their business, not too concerned with my passing. I flashed a small LED light over in the direction, and about 20 feet away sat a grey fox. Watching me. With one eye! I turned my light off and just stood there, feeling its gaze. Two great-horned owls were hooting to each other in some trees about 200 yards away, and the only other sound was from the crickets in the still night air. Many moments went by, and I flashed my light over towards it again. Still there! We watched each other for a little while longer, until finally it made its way quietly into the night, and I could here it foraging around for what I presumed to be “first” breakfast.

 

great-horned owl / Wildcat Canyon Regional Park CA

great-horned owl / Wildcat Canyon Regional Park CA

 

baby raccoon

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 dusk at Mount Diablo State Park – i walked up on a mom and this baby Raccoon having some black berries for breakfast. this one was tiny! they were on top of the bramble, and first I saw mom until she quietly made an exit – then this little one popped up and was about to eat some black berries until he saw me – we stared into each other’s eyes from about 10 feet for about 10 seconds at my eye level, then he silently disappeared down a willow branch into the thicket.

a moon and two planets

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the night sky after dusk on this hot day revealed our Earth’s Moon waxing at first quarter, with Saturn and Mars to the lower right of it. the constellation of Scorpio is just under the Moon, with the “left arm” of the scorpion reaching up to the moon, and Antares, the bright red star in that constellation, shining brightly to the lower left of the Moon.

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Antares is a supergiant star, and said to be 883 times the radius of our sun!

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