Teuri Island is the only breeding site of the Common Guillemot in Japan.
At one time the birds’ population was reduced to 13 birds, but their numbers are now recovering.
This year again, Common Guillemots are seen bringing food back to the nest. Bringing food back to the nest means that chicks are born, and the circle of life continues for these species, which is a very comforting thing to know! The first confirmation was made on 8th of July, so it seems that the Common Guillemot’s breeding season is the same as in previous years.
A project was underway on Teuri Island to use decoys to entice them back to the island due to a decline in their population.
This year, the caves that have been used as breeding grounds have become very cramped with decoys and real Common Guillemots, like a crowded train in Tokyo.
This may be why Common Guillemots have been frequently seen perched on rocks other than the breeding caves since the beginning of July this year.
Pelagic Cormorants also breed on this rocky area and congregate in large numbers in the adjacent hollows. This spot is not visible from land, and can only be observed from a seabird watching boat.
Observation of Common Guillemots went well, as they have been seen flying in groups and floating in the sea in numbers of up to 50.
Common Guillemots fly in flocksCommon Guillemots floating in a flock
The Common Guillemot population, which was reduced to 13 birds in 2002, has been steadily increasing and now exceeds 100 birds. However, there is only one breeding site in Teuri Island so far and no increase in breeding sites has been confirmed, so we hope that the number of breeding sites will increase next time, as there is concern that the population may plummet if there is only one site and natural enemies appear.
Photo & text : Wataru HIMENO
Observation : May-Jul 2023, Teuri Island, Hokkaido
We have summarized the features of three species of birds in the Auk family that are popular amongst birders visiting Teuri Island: Spectacled Guillemot, Common Guillemot and Rhinoceros Auklet!
(1) Carrying caught fish with their beaks.
The main part of the observation is watching birds bringing fish into their beaks to feed their chicks. This is a common feature of the Auk family, as they are able to swallow fish while swimming in the water and cannot spit out the fish once swallowed to feed the chicks. Hence they fly with several fish in their beak to bring the catch back to the nest.
On Teuri Island, night tours are held every evening during the season (from end of April to the end of July) to observe the 800,000 Rhinoceros Auklets returning to their nests in the evening.
Common Guillemot flies with fish in its beak.
Unlike many other species, Rhinoceros Auklet feed their chicks only once a day, when they finally return home in the evening. Therefore, there are several fish for them to bring into their beaks!
(2) Their wings are short and they need to run on the surface of the sea to fly away
When diving in the sea, the Auk family swim by flapping their wings underwater. For this reason, their wings are shorter and smaller than those of other birds of the same size, so that they do not create resistance in the water.
Spectacled Guillemot’s wings
The size of a Rhinoceros Auklet’s wings clearly differs when compared to the size of a Black-tailed gull’s wings.
Due to smaller wings, the Auk family birds do not have high flight capabilities and flap their wings more frequently in the air than bird species of the same size. They also need to run on the surface of the sea to gain momentum in order to take off from the sea into air.
Among the most beautiful is the red-footed Spectacled Guillemot, which runs along the surface of the sea. You can only see this view up close from aboard a small seabird-viewing boat. Please come and see this beautiful moment when you visit Teuri Island!
Close-up seabird photography from the observation boat.
A sea birds observation boat in the ‘Teuri blue’ sea.
Common Murre or Common Guillemot has a distinctive penguin-like appearance due to its legs positioned at the back of its body. In Japan, they breed only in one place, a cliff cave near the red rocks on Teuri Island. The breeding site of the cave can only be observed from the boat, but they can sometimes be seen floating above the sea from the Akaiwa Observatory. In 2002 their numbers were reduced to 13, but now(2023) exceed 100 and is steadily increasing.
Common GuillemotCommon Guillemot
Spectacled guillemot Cepphus carbo
Spectacled Guillemots, with their very cute red legs and red mouth, breed in the crevices of the cliffs that stretch from south-west to north of Teuri Island. The moment when the Spectacled Guillemot takes off after running on the surface of the water is one of the most beautiful moments, when the colour of the sea, known as ‘Teuri Blue‘ and the bright red legs of the Spectacled Guillemot shine brightly. Take chance to watch it up close from a small seabird-watching boat that run s early in the morning (reservation is a must).
Spectacled Guillemot running on the surface of the sea, with beautiful red legsSpectacled Guillemot, observed from Akaiwa Observatory
Rhinoceros auklet Cerorhinca monocerata
As its name suggests, Rhinoceros Auklet has a rhinoceros horn-like projection that appears during the breeding season from April to July. It is said that there are currently 800,000-1,000,000 rhinoceros breeding on Teuri Island, and the sight of them all returning to their nests at dusk is the one to behold. Because they dig holes in the ground to build their nests, which is quite unusual for bird species, photographers can observe them relatively closely when they return home.
Rhinoceros Auklet returning nest in the setting sunRhinoceros Auklet carrying fish to its chicks waiting in the nest
Ancient murrelet Synthliboramphus antiquus
On Teuri Island, they are seen every year from late May to early June. Several birds form groups up to 10 birds and feed on zooplankton and other organisms. Because they are very small and frequently dive, it is very difficult to observe them on days with high wave swell. It is said that they breed only on Teuri Island in Japan – take the rare chance to capture them here.
Ancient murreletAncient murrelet
Pelagic Cormorant Phalacrocorax pelagicus
This cormorant normally lives in the open sea. During the breeding season when they come to Teuri Island, their entire bodies are covered with a amazingly beautiful sheen, and the base of its beak is stained red. They can build their nests in small bumps and hollows in cliffs, using saliva and mud to harden very fine nesting material, so natural enemies such as mammals cannot approach their nests.
Pelagic Cormorant at nesting site, with chicksPelagic Cormorant carrying nesting material
Japanese cormorant Phalacrocorax capillatus
A species of cormorant widespread across Japan. During the breeding season, its head turns white. Cormorants hunt deep underwater where visibility is poor, so they have blue eyes that are easy to see when viewing in the dark. They have a low oil content on their body surface to facilitate swimming easily underwater, and can be observed spreading their wings on rocks to dry their bodies after swimming.
Japanese cormorantJapanese cormorant
Black-tailed gull Larus crassirostris
This species of gull is characterised by its yellow legs and tail with a black band. On Teuri Island, their numbers have increased dramatically in recent years, with the estimated number of nests doubling from two years ago in 2021 to around 5,000 now in 2023. Kurosaki Beach (literally “Black-cape beach” in Japanese), a major breeding ground for Black-tailed gulls, is often called ‘Shirasaki Beach (“White-cape beach”)’ because its black rocks have turned completely white from their excrements.
Black-tailed gullBlack-tailed gull
Slaty-backed gull Larus schistisagus
A large gull with pink legs and a bright white tail. It reigns at the top of the biological pyramid on Teuri Island, and will swallow an adult Rhinoceros Auklet up to 38 cm long awhole. Black-tailed gull chicks, pit vipers and sea urchins are other favorites. If you see sea urchin shells lying around town, they are often the remains of the Slaty-backed gull’s meal.
Slaty-backed gull eating sea urchin
This Slaty-backed gull, just after swallowing a whole Rhinoceros Auklet, has its wings overflowing from its mouth and its chest is swollen with Rhinoceros Auklet!
Photographs & report: Wataru HIMENO
Observation period: May-July 2023, Teuri Island, Hokkaido, Japan
