The little grebes have entered the breeding season.

On April 16th
I found a little grebe nest. Here, the little grebes build the nest by piling up dead leaves, small twigs, algae (waterthyme), etc. on the stems of running reeds that have fallen into the river. It is called floating nest because it floats on the water. Objects that can be used as support include tree branches hanging down to the river, and running reeds growing in the water. This year, nest building is about a month later than last year.
There is a nest at the end of the arrow in the next image.

In the next image, there is a little grebe near the nest. It does not lay an egg. I’m concerned about the presence of a turtle. I once saw a turtle eating eggs of a little grebe.
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On April 17th
There is a little grebe on the nest. It does not lay an egg.

On April 18th
A little grebe laid its first egg.

April 19th.
 It is incubating an egg. Grebes begin incubating eggs immediately after laying eggs.

There is one egg laid on the 18th. No eggs laid today.

On April 20th.
We see one egg. No additional eggs are laid.

A little grebe is incubating an egg.

Hydrangea

The hydrangea is native to Japan. The horticultural varieties are widespread. The original species is Gaku-hydrangea. There are several species of hydrangeas planted along the road in Takinoiri Katsuragi, Moroyama, Saitama, Japan.

The next image shows the ‘gaku’ hydrangea. ‘Gaku’ means the calyx in Japanese.

The hydrangea changes the color of their flowers and sepals depending on the ph of the soil. Acidity makes them blue and alkalinity makes them red. In addition, it is affected by other factors.

The hydrangeas are planted along the road.

Asian house martins collecting mud

Asian house martins were collecting mud on the riverbank.
An Asian house martin pecked at the carcass of a fly.

An Asian house martin pecking at the mud.

Another Asian house martin pecking at the mud.

The Asian house martin pecked at the carcass of a fly.

The bird bit the body of a fly.

The bird did not eat the fly and put more mud in them.

Watch the videos to learn more.

Great egrets flying in V formation

When I was watching the Eurasian tree sparrows in the reedbeds, I saw great egrets flying in a V-shaped formation from the upper of the Oppe River. The river bends at a right angle, but the great egrets continued straight ahead, blocked by houses, and disappeared. It was a rare sight (taken on January 20).

Great egret flying in formation.

The id of youtube is “hachi ai”.

The gadwalls were stealing algae from the Eurasian coots.

There are about fifty gadwalls and several Eurasian coots in the river. 

The coots collect algae at this time of year. The gadwalls attach to the coots. When coots are collecting algae, the gadwall will take away the algae spilled by the coot, and sometimes the algae that the coot is holding.


The coot dived to collect algae.

A gadwall stole algae from the coot.

The next is a video of the sequence of actions.

The other scene is next.
A coot dived to collect algae.

A gadwall chases the coot that has taken algae.

The gadwall tries to steal algae from the coot.

The gadwall stole algae from the coot.

Next is a video of the sequence of actions.

A mandarin duck was courting the spot-billed ducks.

Mandarin ducks are occasionally observed in our area. In the fall, the mandarin ducks are on migration. On October 4, we saw two mandarin ducks 4 km downstream from here. Those images are shown below. The one on the right is


a male because of its red beak. This individual is an eclipse. On the left, it is hard to distinguish whether it is a young bird or a female. Now these birds are not there.

This brings us to the main topic. One male mandarin duck was with a group of spot-billed ducks on October 17. It was swimming around with these.


Then, to our surprise, he began courting them. He quickly raised his head.

Then he lowered his head. He repeated the same behaviors.


The mandarin duck tried to approach the spot-billed ducks, but they were running away from him. Still, the mandarin duck did not flinch.


For more information, please see the following video.

My youtube account is “hachi ai”.

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