Brandt’s Cormorant Diet Studies

—– Written for (and cross-posted from) the excellent Point Blue Conservation Science Blog – Los Farallones —–

My internship at the Farallones involved many different fascinating studies, but one of my favorite studies were the seabird diets, as they really tie in the oceanographic aspect of marine ornithology. We are lucky to be able to live on this incredible, rugged island surrounded by the Pacific ocean and work with the birds that call it home, but sometimes it can be easy to take for granted just how strong the connection is that these birds have to the marine environment. By incorporating the feeding ecology of the seabirds, we are also considering vast topics like oceanic health, fisheries ecology, and climate change, much of which is still poorly understood. Taking part in studies that delve into this mysterious, watery realm is pretty exciting. Brandt’s cormorants also happen to be one of my favorite birds on the island – how could you not love the silky black birds that look like Muppets with long necks and giant feet, and whose eyes are a vibrant, deep turquoise?


Male Brandt’s Cormorant in full display glory

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Crested Auklets

One of the most charismatic, yet underappreciated birds on the planet has got to be the Crested Auklet (Aethia cristatella). Crested auklets are ridiculously goofy-looking birds during their summer breeding season.


Most species of seabirds are pretty unassuming in appearance, with a standard palette of blacks, greys, white, and browns, and the sexes are frequently similar. -Part of the reason for this contrast with much showier avian groups like parrots and songbirds is because of the parental investment that seabirds engage in. Most species are long-lived and only raise one or two chicks a year. In Crested Auklets, both parents engage in parental care, often sharing incubation and feeding duties – although at least one study showed that CRAU males tended to brood and defend chicks more often, while females tended to forage and bring food back for the chicks more often. This serial monogamy means that there is no pay-off for the male bird to copulate with as many females as possible, as they all already have a mate, a brood, and it takes a lot of work to care for and raise the single chick.

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Birds of 2014

2013 was pretty great with Asian birds. Got back into the US just in time to start the new year, so 2014 starts with California birds and then the glories of birding the Aleutian Islands!
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Seabirds and Rats

With a dual interest in the seemingly distantly related fields of marine biology and ornithology, seabird ecology emerges as a definitive choice of study for me personally.  As the synthesis of my two favorite areas of science, it also has the potential to extend into other fascinating fields of study involving conservation biology, resources management, island ecology, biogeography, fisheries, oceanography, evolution, and behavioral ecology – all of which are topics of import on their own, but framed through the lens of seabird ecology, present expansive research opportunities.

rats' eye view of Witchcraft Point, Kiska Island, from the deck of the Tiglax

rats’ eye view of Witchcraft Point, Kiska Island, from the deck of the Tiglax

I find myself most engaged by topics that address the interplay between components of ecological systems. In many ecosystems, seabirds play a vital role of connecting the biomass of the oceans with those on land. They act as conduits of nutrient transport, therefore playing vital roles in the ecosystems they are part of. On many oceanic islands, terrestrial life would not be sustained without the activity of nesting seabirds. Since many oceanic islands (especially in the Pacific) are volcanic in origin, they were never close enough or connected to land masses from which mammals, crawling insects, reptiles, etc could colonize. This made them blank canvases for birds who could simply fly across vast watery moats – and in so many cases, avian life dominated many remote islands and through the raw power of evolution, adapted to fill a wide variety of niches. With the lack of land predators, there were many instances where birds simply lost their ability to fly. Of course, as humans came to dominate the planet and expand across it, many islands were discovered by sea-faring groups. This was unequivocally bad news for the islands’ bird species, especially those flightless ones. Many avian species were extirpated within a short period of time after human discovery, falling as easy prey. Another important issue that came later was the introduction of other species to islands – goats, pigs, cattle, cats, mice, and especially…rats. Invasive rats have been inadvertently introduced through human activities to about 90 percent of the world’s islands. This statistic is almost unbelievable. Even more scary is the result of these invasions: they are responsible for approximately 50% of all island bird and reptile extinctions. Thus it is not surprising that Norway rats present a serious and ongoing threat to seabirds in the Aleutian Islands. They have invaded entire islands, introduced through human shipping activities. Currently there are about a dozen islands where rat populations are established, and consequently bird populations on those islands have been decimated. The first invasion event in the Aleutians was likely a Japanese shipwreck in 1780, where everyone but the rats perished. Rats are especially harmful because they breed quickly, can eat pretty much anything, and do so opportunistically – including seabirds, their chicks, and their eggs. On many islands this was catastrophic, wiping out a significant portion of crevice- and burrow-nesting seabirds like auklets, storm-petrels, and puffins during their short summer breeding season. The worst thing the rats would do is not just killing to feed, but indiscriminately killing dozens of birds and eggs in one haul.

adult Least Auklets and eggs from a rat cache from Kiska Island (pic from Natl Geographic)

In fact, the group of Aleutian islands immediately to the east of Buldir are called the Rat Islands because of their overwhelming domination. Buldir itself has been kept rat-free thanks to its isolation and distance from any nearby islands where rats might colonize from. Buldir sits in the middle of a shipping lane between Russia and Asia. We would frequently see massive container ships pass by on the horizon. Just from the frequency of passes, the risk for rat invasion is relatively high. Weather in the Bering Sea is notoriously challenging, and an average of two ship incidents happen a year. Rats are certainly inhabitants on almost all of these vessels, and they know when to leave a sinking ship. Fish and Wildlife appropriately has a “rat spill” team that responds to sinking ships, attempting to prevent any swimming rats from reaching shore using floating barriers. The communities on the populated Pribilof islands of St. Paul and St. George proactively maintain an island defense network against rat invasion. The native Tribes offer rat prevention kits to fishing vessels that visit harbor, and local fish processing businesses are required to have rat prevention systems in place. Rat traps are deployed and maintained in harbors and dumps – and in over 15 years, they have caught 6 rats this way, meaning that there is indeed movement of rats from ships in harbor onto the islands.

A bit of good news: the Rat Islands have been the site of a successful rat eradication campaign that resulted in the declaration of one of the islands (now re-named Hawadax, Aleut for “those two over there”) completely rat-free in 2009. This was the result of a tremendous cooperative and costly effort between the US Fish and Wildlife, The Nature Conservancy, and Island Conservation. The entire island was basically heavily treated with poisoned rat bait…and it seemed to have worked.

Human effects, both direct and indirect, are having consequences on seabird populations around the world. Few people come into direct contact with seabirds, and yet through various activities (seafood consumption, plastic use/abuse, climate change, invasive/introduced plants and animals, pollution, oil spills), most species are suffering from consequences exerted by humanity.  Seabirds can seem to be so far removed from human activity that some people are baffled at even the idea of a “seabird”.

Buldir Island – Remote Field Camp Preparation

So, I will start from the beginning, going a little bit in depth in terms of the gear that I brought with me.

I love gear lists because not only do I find other peoples’ lists interesting, considering their own thought processes during prep, but incredibly useful in terms of considering what I might like/need to bring.

After applying, being interviewed, and finding out I was chosen to go on the expedition, I had a month and a half to get everything ready and in order.  I put a lot of thought into packing. It was really important to bring the right stuff because out there, there would be no supplementing gear if I needed more. I would only have what I brought with me, for two whole months in harsh conditions, and so I knew I would be better off (over) prepared.

Never having been to the Aleutians, and living in southern California, it was difficult to envision the precise gear I would need. I knew, however, that the short summer season climate there is consistently rainy, windy, cold, humid, and overcast, with temperatures ranging down into at least the 30s at night. I knew I would have to bring plenty of warm and waterproof clothes. Luckily, I still had a lot of my gear from Antarctica in good shape – in addition to all my camping/outdoors gear. Still, there were certain things I would need to get.

Another small thing to consider was the fact that there would be only hand-washing, and that due to the precipitation levels, I would need to be able to put that off as much as possible. Luckily, I have plenty of wool layers – a property of wool is that it does not harbor the bacteria that make for bad body odor smells – a truly wonderful property that was very much appreciated on Buldir.



  1. Ski Jacket – outermost layer that was primarily used while observing birds from the blind, to keep warm while sitting motionless for hours.
  2. Rain Jackets x 3
    1. Patagonia Triolet – this was a new purchase, and I justified an expensive GoreTex jacket knowing that it would serve me well far beyond Buldir. These are breathable, waterproof jackets you buy for life.
    2. Old TNF rain jacket – used for field work, I got this jacket irreparably filthy while wearing it daily for field work. It got covered in guano, paint, and mud, but performed great!
    3. Marmot Precip rain jacket – back up in case the others didn’t perform or were destroyed or ripped irreparably. I didn’t actually ever need to use it, but it was wise to bring along just in case.

      soaked outer layers on the hike to Spike Camp

      soaked outer layers on the hike to Spike Camp

  3. Ski Pants x 2
    1. Marmot GoreTex pants – I found these for a great deal and thought they would come in handy on the island. They were too nice to wear during field work, but they were a good pair to have for other activities. Durable, waterproof, breathable.
    2. Roxy ski pants – never used them and really didn’t need to bring them.
  4. Waterproof Pants Shell
    1. Patagonia Rain Shadow pants – these were awesome. I ended up using these on a daily basis and they were really great. Only a few rips after days spent rubbing up and scooting down and climbing over rough granite boulders on the talus (thanks, RipStop!).
    2. Sierra Designs Microlight pants – a super thin, lightweight packable waterproof layer. I would never wear these while working (they would rip on the granite in a heartbeat), but they were useful around camp on wet days.

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Buldir Island Seabird Work

I spent the summer of 2014 working on a tiny island at the boundary of the North Pacific and the Bering Sea. This island, Buldir, is one of about 300 in the Aleutian Island chain, which arcs out from mainland Alaska approximately 1,400 miles. Buldir itself is located in the far western portion of the island chain, making it one of the furthest away from the mainland, and also almost the most-western bit of the United States (Attu holds that distinction, three islands to the west). Buldir is closer to the Kamchatka Peninsula of Russia than it is to the United States. All in all, this was one of the most remote places on the planet, and I was incredibly lucky to have scored a position there for two months, along with six other young naturalists, monitoring the breeding seabird populations on the island. It was the experience of a lifetime.


Surrounded by the Pacific Ocean and the Bering Sea, Buldir is a true oceanic island in every sense of the word. It is home to hundreds of thousands of seabirds that come to the island to breed during the summer. In fact, Buldir is the most diverse seabird island in the world, acting as breeding grounds for 22 documented seabirds species. It is seabird heaven, the perfect place for someone like me – with my education in marine biology, experience in ornithology, and deep, abiding interest in the synthesis of the two in the form of SEABIRDS. And it was a transformative experience.
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Nepal: Kathmandu

Kathmandu is a chaotic city – a metropolis by number (with a population of 975,000 within city limits, and 2.5 million in the surrounding area) it is absolutely bustling, seeming like it grew out organically from the center. With densely crowded streets mostly lacking pedestrian sidewalks, navigating the streets and alleys in the Thamel district is initially harrowing.

The average tourist is initially completely overwhelmed by the sights and sounds on the street – mostly because you are right there in the middle of it, and has likely never experienced such sensory overload. Just trying to walk to the nearest restaurant or shop will entail squeezing by street vendors and their wares, veering around other pedestrians and tourists, and having to quickly get out of the way of honking cars, motorbikes, and tuk-tuks. You scramble over trash piles and potholes in the street as there are no sidewalks. Wave after wave of food, animal, sewage, and mysterious smells wash over you. There is a constant, grating onslaught of honking as cars and motorbikes veer around pedestrians in the narrow streets. You come to realize that the honking is not meant in the aggressive American language of “Get out of the way!” but more of a kind of constant “I’m here…Here I am…Coming by!” which means no offense but actually is a safety precaution, given the complete lack of strict traffic laws. And in all the time that we spent in and around Kathmandu, we saw only one accident (where someone had, inebriated, driven off a bridge and into a drainage ditch). Granted, there are less busy, more peaceful areas of the city, most of which tourists never venture out to see.

A landmark for this area - a large, dust-covered tree

A landmark for this area – a large, dust-covered tree

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