We are investigating territorial defense behavior against intruders at the nesting site of a breeding pair of Peregrine Falcons.
- 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。
Observation Date: 2026-03-05Weather: SunnyWind: NW 4m/sTemperature: 10°C
9:20 Start time 観察開始
Both Peregrine Falcons absent this morning. No individuals observed.
- 今日は朝からハヤブサは２羽ともに出払って姿が見えない。
10:10 Both Peregrine Falcons returned. Circling high overhead at approximately 415 m.
The laser rangefinder proved very useful. Distances up to 886 m were successfully measured, even when the birds appeared only as dots to the naked eye.
- ２羽ともに戻り。上空415ｍで旋回。かなり高い位置。レーザー距離計が大活躍！今日は最大886ｍまで計測できた。肉眼では点でも計測できた。
Two fellow bird observers were present today, and we spent more time exchanging information than observing.
- 今日は野鳥観察の仲間が2人いて観察よりも情報交換が盛んだった。
11:30 Observation ended.
- 観察終了
Summary (まとめ)
The laser rangefinder was used today and performed better than expected.
Being able to record precise distance measurements will be a valuable tool for this study.
Unfortunately, an Osprey entered the territory just as I was packing up to leave,
so no distance measurements could be taken.
The Peregrine Falcons did not attempt to chase it away.
This observation will be examined further in future surveys.
- 今日はレーザー距離計を使ったが、予想以上に好感触だ。正確な数値でデータが残せるのは武器になる。残念なことは片づけして帰るときにミサゴがテリトリー侵入して計測できなかった事だ。ちなみにハヤブサは追い払いしなかった。次の観察につなげたい。
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