ハヤブサのつがいが巣営する場所でテリトリー侵入者への防衛行動を調べています。
We are investigating territorial defense behavior against intruders at the nesting
site of a breeding pair of Peregrine Falcons.
２０２６年 Day8
2026/02/20(金) 曇り ３℃ 北東2ｍ/ｓ
9:00 観察開始 start
右の崖の上に１羽確認(大きさ的にメス？)
- One individual was confirmed on the right cliff (likely female, judging by size).
9:10 100m以内上空をトビが通過したがハヤブサは反応なし
- A Black Kite passed within 100 m above, and the peregrine showed no response.
9:20 50m以内上空をトビが通過したがハヤブサは反応なし(近い！)
- A Black Kite passed at less than 50 m overhead; despite the close proximity, no defensive response was observed.
ハヤブサは他の鳥の「通過するだけ」と「旋回して探している」のパターンを見分けている。
- These observations suggest that the peregrine differentiates between transient overflights and circling behavior indicative of potential intrusion.
これが子育てシーズンだとどう変化するかを後ほど調べたいと思う。
- Future observations will examine whether this behavioral distinction changes during the breeding season.
10:04 50~100m上空を1羽のミサゴが侵入、旋回を約40秒したが2羽ともハヤブサは全く反応なし。
- A single Osprey entered the airspace overhead and circled for approximately 40 seconds; neither peregrine showed any response.
魚を主食とするミサゴは侵入しても害はないので「ミサゴは安全」とハヤブサは認識しているのか？この事案も今後データを重ねて証明していきたい。
- These observations raise the possibility that peregrines distinguish piscivorous Ospreys from more competitive intruders. Further data will be required to substantiate this hypothesis.
10:12 ハヤブサ2羽が海の方へ飛び立つ。餌探しと思われる。
- Both peregrines took off toward the sea, likely in search of prey.
10:20 ハトを捕まえて帰ってきた！（♀）
2羽ともに戻り。狩りの時間は8分。
- The female returned carrying a pigeon. Both individuals were back at the site. The hunting trip lasted approximately 8 minutes.
オスは30分以上食べ続けていた。その間にもう1羽はまた狩りへ出かけた様子。
- The male continued feeding for more than 30 minutes. During that time, the other individual appeared to depart for another hunting attempt.
11:00 観察終了
- 11:00 Observation ended.
まとめ (Summary)
今日は調べたい・継続していきたいデータが取れた。データを積み重ねてハヤブサの防衛行動の本質に迫りたい。
- Today, I was able to obtain data that I would like to examine further and continue accumulating. By building upon these observations, I hope to approach a deeper understanding of the fundamental nature of peregrine territorial defense behavior.
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