ML611029641
Laguntzailea
Data
Kokapena
- Adina
- Zehaztu gabea
- Sexua
- Zehaztu gabea
- Grabaketa
- Zehaztu gabea
Behaketaren xehetasunak
The sky was clear with some cloud on the horizon in the direction the sun was setting. Sunset was 19:58 local time and there was a strong breeze coming from the south-east. Last year we visited the rookery on October 15 (refer to eBird checklist S120749463) and following is a comparison between the two visits, some three weeks apart in their respective years. First birds were seen gathering a kilometre or two offshore, and relatively close to sea level: October 15, 2022 - Thirty minutes prior to sunset November 4, 2023 - Ten minutes prior to sunset First birds crossed the cliffs and circled the rookery: October 15, 2022 - Ten minutes after sunset November 4, 2023 - Twenty-five minutes after sunset Majority of the birds in their burrows: October 15, 2022 - Thirty-five minutes after sunset November 4, 2023 - Forty minutes after sunset The above differences may be partially the result of more ambient light at sunset (due to less cloud cover) on the second visit. Bird numbers: October 15, 2022 - Estimated at 30,000 November 4, 2023 - Estimated to be 20% less than the previous visit (24,000) It is possible that as egg laying approaches around November 20, some birds were electing to stay out at sea rather than return to the rookery each evening. Burrow maintenance: October 15, 2022 - Much burrow maintenance still in progress November 4, 2023 - Very little burrow maintenance still in progress as egg-laying draws nearer Calling: October 15, 2022 - Generally minimal calling from burrows, however occasional harsh and aggressive calling heard. November 4, 2023 - Frequent loud calling from burrows. Possibly these are prospectors, or young birds present in the rookery that may or may not form a pair bond and breed. Audio recorded.
Informazio teknikoa
- Grabatzailea
- Mikrofonoa
- Osagarriak
- Fitxategiaren tamaina originala
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