At 6 o'clock the morning, unfamiliar voices from somewhere on the Sumida River Terrace of Ishikawajima Park are echoing.
If you look closely, you can see a black silhouette near the center of the river surface.
It's bigger and plump than Mr. Kawau, what is it?
Even if you use the telephoto of the camera in the backlight of the morning sun, you will not be able to determine its identity.
Fortunately, we are gradually approaching the flow of the Sumida River.
If you reach a certain distance here, you will return to the middle of the river again.
After such a repetition several times, what is their identity captured by the camera!
Four young birds from black-tailed gull.
The silhouette of the beak clearly seen when facing sideways is exactly that of black-tailed gull.
But is the color and pattern of the wings covering the body discovered a new species? It's different from adult bird, which is just mistaken.
black-tailed gull often picks fish that serve food at fishing ports.
It is an image of flying in groups near the fishing port.
(As an aside, seagull is migratory bird and a winter bird, so it is not in summer.
All birds like seagull that we witness in the summer are seabirds.)
As you all know, it sounds like a mecher and a cat.
In kanji, it is described as a sea cat, but the English name is Black tailed gull because it has a black belt on the white tail.
Here's adult bird.
Mrs. black-tailed gull and others as you imagine.
Well, where did these young birds come from?
Is it from a breeding ground along the Kanto region? I'm not sure.
black-tailed gull is one of the world's largest cities in Japan.
Sakhalin, Chishima Islands, Mainland China Coast to Taiwan.
It is a rare bird in the world
Five breeding grounds in Japan, including Kabushima Island in Aomori Prefecture and Tsubaki Island in Iwate Prefecture, are designated as natural monuments.
Only those that hatched in breeding grounds and grew from young bird to young birds appear in each fishing port in summer.
black-tailed gull seems to have a very high sense of territory, and the parent bird attacks another chick approaching the nest.
The chicks also get wounds until they die.
The young bird who came to this Sumida River was
It seems to be elite in the elite that has survived for about two months since hatching.
black-tailed gull takes three years to breed from young bird to adult bird.
It seems that it can be identified for several years from that feather.
Mr. black-tailed gull in the upper right of the photo above is still gray and some of his wings are brown.
It can be seen like the second year.
The breeding adult bird will return to the breeding ground at the end of February next year, but the young birds will winter.
It is divided into a group that can be observed all year round on the Sumida River and a group that returns to a breeding ground.
The more you know, the deeper you are, Mr. black-tailed gull.
How old are you from now on? I would like to observe it while thinking about it.
The bulldozer told the observation deck
of the Harumi Passenger Terminal that the development of the Olympic and Paralympic athlete's village began.
The Rainbow Bridge and the night view around you will make you feel very romantic. observation deck's summer opening hours are until 20:00. It is convenient because the Toei bus 
runs continuously toward Ginza. Enjoy the evening Bon Odori in Harumi and 
the night view
July 18 is the day of the sea.
