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シジュウカラの子育て(2)、ヒナ誕生  Titmice raising their young (2), birth of chicks

316日に庭の巣箱に巣作りを始めたシジュウカラが約一ヶ月後の今日419日の時点で9つの卵すべてがヒナに生まれました。(添付写真は誕生後4日くらいです。)

多くの単語を持ち、会話していると言われるシジュウカラは賢明で、ヒナの個体差が生じないように一斉にヒナになるように抱卵するとのことです。

現在、ヒナ全部が成長して無事に巣立つように親鳥は一時間に10回以上、一日10時間として100回から150回も、餌運びで大忙しです。昨日のような雨の日も休みません。(動画、50秒、https://drive.google.com/file/d/1h5hWN4SMcN6QAguzYPUDSD7rsTiuOnyq/view?usp=sharing

巣箱に入る前に鳴いてヒナに知らせる場合もあります。

一匹が巣箱に入っている時には外で待っている場合がありますが、入り口で餌を受け渡したり、2匹とも巣箱に入る場合もあります。

餌の種類はヒナの成長度に従って大きさと種類は変化するのでしょうが、ヒナの誕生直後はヒナが食べやすいように小さなものを運んでいました。現在は目視できるほどの大きな餌になっています。

巣箱の中を清潔に保つために親鳥はヒナの糞を運び出します。

夕方7時以降、暗くなってからは親鳥が巣に入るようです。

ここ一ヶ月以上、ほとんど毎日、机ついている数時間、上述のようにずっと様子を見ていると新しい発見があり、感動します。

The tits began nesting in a nest box in the garden on March 16, and as of today, April 19, about a month later, all nine eggs have been born as chicks.( The photo was taken about 4 days after birth.)
The titmouse, which is said to have many words and to be able to converse, is smart enough to hold its eggs so that all chicks will be chicks at the same time, so that there will be no individual differences among chicks.
Currently the parent birds have been busy carrying food to the nest at least 10 times an hour, 100 to 150 times in 10 hours a day, to ensure that all the chicks grow up and leave the nest safely. They never stop feeding chicks even on rainy days like yesterday.

(Video, 50 seconds, https://drive.google.com/file/d/1h5hWN4SMcN6QAguzYPUDSD7rsTiuOnyq/view?usp=sharing)
They sometimes chirp before entering the nest box maybe to let the chicks recognize them.
When one of them is feeding chicks in the box, the other waits or passes the food at the entrance, but sometimes the both enter the nest box.
The size and type of food may vary depending on the growth of the chicks, but immediately after the chicks were born, they carried small pieces of food to make it easier for them to eat. The food is now large enough to be visible.

To keep the inside of the nest box clean, the parent birds carry away the chicks' droppings.
They enter the nest after 7:00 p.m. when it gets dark.
I have been impressed by the new discoveries I have made during the past month, almost every day, during some hours I spend at my desk, observing all the time as described above.