Tag Archives: gulls

Citizen science for urban dwellers

I just discovered the Cornell Lab of Ornithology’s Urban Bird Studies program. Urban Bird Studies consists of a number of interesting citizen science projects observing birds and bird behaviors in cities: Pigeon Watch, Crows Count, Dove Detectives, and Gulls Galore. As you might have guessed from the names of the individual projects, the target audience for these projects appears to be kids, and they have lots of photos of school groups full of cute kids with clipboards.

Nonetheless, it looks like there’s some pretty interesting science underlying each of these projects. For example, the Gulls Galore project aims to gather data to help ornithologists understand when and in what ways adult gulls relate to subadults and juveniles. And just looking at the tally sheets and the study site habitat form help me better understand what ornithologists do.

Better yet, Cornell Lab of Ornithology understands that it’s a Good Idea to help us urban dwellers to observe and understand our urban ecosystems, through careful observations of selected species. Now I’m trying to decide if I have the time to work on the gull project — it sounds like fun.

Gulls and crab

A few days ago, I was walking on Pope’s Island near the marina, seeing if any of the recreational boats had been taken out of the water yet. I happened to be watching as an adult Herring Gull suddenly swooped down and landed on the water right next to the rocks that make up the shore of the island. The gull stuck its head down in the water, balanced itself with a flurry of its wings, and came up with something in its bill.

The gull flew right in front of me, and landed in the marina’s parking lot about a hundred feet from where I was standing. It had a fair-sized crab, and it appeared that the crab was still moving. The gull lifted up its head, dropped the crab on the pavement, and quickly picked it up again. As far as I could tell, that drop was the coup de grace, and the crab no longer moved after that.

The gull shook its head with the crab in its bill, put the crab down, turned its head on the side, and pecked at the joint between the upper and lower shells. I walked a little closer as it repeated this maneuver several times. By now, it was pulling little bits of flesh out of the crab and gulping them down.

A second gull flew over, gliding in and landing a safe distance away, and watching the first gull eat. A third gull flew over to watch as well. But the first gull was very adept at eating the crab, and the other two gulls quickly gave up and flew away, either to search for food on their own or to find a clumsy gull from whom they could steal food.

Then a first-year gull flew over, awkward, with its drab brown plumage, and landed fairly close to the adult Herring Gull. It landed clumsily, hunched its shoulders, and gave the keening cry that baby Herring Gulls give when they’re in the nest asking for food from their parents. The adult gull shook the crab very hard a couple of times, and a couple of the crab’s legs flew off. The adult let the first-year gull steal one of the crab legs, which it quickly swallowed whole.

Pretty soon, it looked to me as though the adult had finished all the meat in the crab shell, so I ran over and chased the two gulls away to see what kind of crab it had been. All that was left was the top shell of a Green Crab (Carcinus maenas); its shell measured nearly six inches from point to point.

Eight things I noticed on the beach yesterday evening

Ferry Beach, Saco, Maine

A Herring Gull swooped down onto the beach a hundred yards in front of me, carrying something large in its bill. Through the binoculars, I could see that the gull was carrying a fish, maybe a flounder, that looked too big for it to swallow. A young gull stood nearby, watching and hoping the older gull would drop the fish. The adult gull tossed the fish in the air, dropped it several times, tried to maneuver it so the fish’s head was pointing down the gull’s throat, and then, so quickly I didn’t see it, swallowed the fish. I could see a bulge in the gull’s throat. It swallowed hard a couple of times, then flew away.

A light rain shower passed over the beach, leaving the sand pockmarked with tiny craters where the big raindrops had hit.

I looked out over Saco Bay as the rain showers passed. The sun broke through the clouds in the west, and lit up Eagle Island, which is a mile or so out in the bay. The island stood out, bright and green, against the dark blue clouds and the dark gray sea. More sun came out, and picked out the tops of waves as they broke against the beach, turning them from a dull color to brilliant white.

Bits of a rainbow appeared in the sky: two short, bright bands at the horizon, marking out the north and south points of the bay; and pieces here and there against the dark clouds, so faint that at times I wasn’t sure if I was seeing them or not.

A Common Tern hovered over the water. I managed to get my binoculars up in time to watch it break out of its hover, plunge into the sea, and emerge with a small fish in its bill. It flew up, tossed the fish back and swallowed it, and shook itself dry as it flew off looking for more fish.

Halfway out to Eagle Island, fifty or sixty white specks appeared in a sudden ray of sun, circling around, hovering, and plunging into the sea.

Through some odd optical effect that I don’t understand, broad rays of alternating light and dark appeared in the clouds, radiating out from Wood Island; or perhaps I should say, converging down towards Wood Island. If I wasn’t aware that the sun was almost directly behind me, I would have thought that the sun must have been behind Wood Island, as if somehow the sun were setting in the east southeast, instead of in the west.

A dozen Bonaparte’s Gulls stood on the beach, keeping an eye on me now and then, but mostly doing nothing. They were all molting, losing the crisply-defined black heads of their breeding plumage, losing the odd tail feather, looking rather bedraggled. Presumably, these were first-year birds that never made it all the way up to the breeding grounds in Canada, and so here they sat on the coast of Maine, molting and waiting for the fall migration to begin in earnest. It was a poignant sight, an anticipation of the end of summer.

Posted two days after the fact — I’m a little behind in posting due to spotty Internet access here in Cambridge.

On the rooftops

The rooftops of downtown New Bedford host a Herring Gull nesting colony. Yesterday and today I went searching for gull nests. I climbed up onto the roof of First Unitarian church, roamed the top deck of the Elm St. parking garage, stuck my head out of one of the skylights in our apartment, and poked around into a small urban park, and the video has footage from all four places.



Click To Play

If you prefer to download a Quicktime movie, click here.

Yesterday while I was shooting video up on the parking garage, I wound up talking with one of the people who works at the parking garage. Last year, they had a dozen nests up there, and the Herring Gulls made something of a nuisance of themselves. This year, he’s up on the top deck every day, sweeping out nesting material before the gulls get a chance to get settled in. “Just call me an apex predator,” he said.

One final note to those of you who are birders — I’m pretty sure I saw nesting Great Black-Backed Gulls from the roof of the Elm St. Parking Garage, but they were far enough away that you’d need a scope to be sure. They were on a building just about due east from the parking garage.

Happy 300th birthday

Today is Carl Linnaeus’s 300th birthday. Linnaeus invented binomial nomenclature, those two-part Latin names biologists have for living organisms.

I celebrated Linnaeus’s birthday by going out for a walk.

Just down the street from our apartment, I noticed that several Alianthus altissima — an invasive exotic that can be difficult to eradicate — are springing up near the pedestrian bridge over Route 18, and I wondered if the city would remove them before they overwhelmed all the nearby plants. Then I realized that the nearby plants were Euonymus alatus, an equally pernicious invasive exotic.

On the Fairhaven side of the bridge, the tide was low. Standing on the mud flats I saw quite a few Larus delawarensis and Larus argentatus, and a Larus marinus standing there preening. Two Branta canadensis swam in amongst the gulls.

Happy birthday, Carl Linneaus. For even though using binomial nomenclature in ordinary conversation is a pain in the neck, we still admire your genius as a taxonomist.

Blogger BioBlitz 2007 final list

Today was my only day off this week, and I had planned to do my Blogger BioBlitz survey today, trying to find how many of each different species — plant, animal, fungi and anything in between — live within the small area I chose to survey (the garden at First Unitarian in New Bedford). We had heavy downpours most of the day, so I had to cut the survey short. In between rain squalls, I took as many photos of living things as possible; I also relied on photos and notes I had taken earlier in the week when I was surveying the area. Unfortunately, the weather meant that I didn’t have time to search out many animals (e.g., I wasn’t able to dig up some soil and look through it for invertebrates, etc.).

My identification of many plants was hampered because it’s still early in spring and many plants have just begun to emerge from dormancy or sprout from seeds; and only a few of the flowering plants were actually in flower. I’m thinking I may continue with this survey of living things over the course of the summer, to see if I can do additional identifications.

I’ve included my list of organisms below, arranged in rough taxonomic order. Over the next week, I’ll be working on further identifications as well as filling in the taxonomic order, and when done I’ll update this entry. (Final update, 28 April, link to final data sheet included.)

Video tour of the site.
Photos from field work.
First post on Blogger Bioblitz 2007.
Second post on Blogger Bioblitz 2007.

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Spring watch

Monday:– The weather forecast had predicted a few snow flurries on Monday evening. Sure enough, as I went in to the district Board meeting over in Middleboro at 6:45, a few fat flakes floated down from the sky. But by the time I walked out of the Board meeting two hours later everything was covered with four inches of snow — that’s a little more than a flurry.

Tuesday and Wednesday:– It felt warm when the sun was out. But when the sun wasn’t out, and when the wind was blowing off the 35 degree ocean water, it felt like winter again.

Thursday:– The gulls are starting to get more active. I suppose they are starting to pair off for breeding season. I’ve been hearing them screaming at each other all evening long, and every once in a while it sounds like one gull throws another one down onto our roof from the building next door.

Winter

Today, for the first time this year, I saw ice floating in the harbor. Even though today the temperature almost got above freezing, you can finally see the effects of the cold snap of the past week. There was a shelf of ice in a sheltered area on the Fairhaven side of the harbor. The wind broke off small pieces of it. Three gulls sat on one such piece, drifting along towards Pope’s Island, surveying the world as the piece of ice spun slowly around. On the other side of Pope’s Island, I watched two Harbor Seals playing in the deep water of the main shipping channel. With the cold weather, the seals have moved back into the harbor again. One stuck its head and neck up out of the water; through the binoculars I could see its dark eyes and its whiskers dripping water.