Birds
The unpaid oak forester. Buries acorns in autumn caches across the Bos and forgets a fraction — those become the next generation's oaks. Without jays, the Bos's Quercus regeneration would slow dramatically.

| Total observations in the Bos | 616 |
| First recorded | 1969-03-07 |
| Last recorded | 2026-05-13 |
| Max rarity tier | 1 — common |
Data derived from 136,107 waarneming.nl observations at location 5013 (Amsterdamse Bos), scraped May 2026. Bos-context text: manually composed from the Bosplan 2020–2030, amsterdamsebos.nl, and the existing Het Onzichtbare Zichtbaar dossiers.