Turtles
Olive Ridley Turtle
Lepidochelys olivacea · Marine reptile — family Cheloniidae
The olive ridley is the ocean's commonest sea turtle and one of its least seen by divers — a modest, round-shelled animal in gray-green that spends its life offshore rather than posing on reefs. Its fame rests on one of nature's numeric marvels: the arribadas of Ostional and Nancite in Costa Rica and Odisha in India, when a season's females arrive in coordinated waves and beaches vanish under nesting turtles. Underwater encounters are surface crossings — a small head raised mid-ocean, a pair drifting in the blue off Baja or the Revillagigedos. Sheer abundance hides real vulnerability; a species that concentrates itself so densely can be hurt at scale just as fast.
どこで・いつ見られるか
「常駐（Resident）」とは、そのダイビングスポットでのほとんどのダイブで遭遇できることを意味します。「季節限定（Seasonal）」とは、記載された月に確実に見られることを意味します。それ以外の出会いはボーナスであり、計画の前提にはなりません。
| 目的地 | 信頼性 | 月 | メモ |
|---|---|---|---|
| Costa Rica Pacific CoastCosta Rica | Seasonal — reliable in season | Aug–Nov | |
| Socorro & the RevillagigedosMexico | Occasional | 年間を通じて | |
| Sea of Cortez & Cabo PulmoMexico | Occasional | 年間を通じて |
ベストな月、一目でわかる
理解を深める
ハビタット: Open tropical ocean and soft-bottom coastal shelves; not a reef turtle — most of its life passes offshore
分布域: Pantropical, with enormous eastern Pacific and Indian Ocean populations; mass-nesting beaches in Costa Rica, Mexico, and India
生態・行動: Famous for the arribada — synchronized mass nesting in which tens of thousands of females storm a single beach over a few nights, a strategy that swamps predators. At sea it drifts and forages alone, often logging motionless at the surface far from land.
食性: Crustaceans, jellyfish, tunicates, and small invertebrates taken in open water and on soft bottoms
サイズ: 目安は 0.65 m; 確認済みの最大記録 0.75 m (carapace length; the smallest sea turtle alongside its Kemp's ridley sister species).
出会ったときの正しいふるまい方
Arribada beaches are strictly managed — enter only with licensed guides under national park rules. At sea, give floating turtles space; they may be resting, mating, or accompanied by boats' propellers too often already.
保全
Vulnerable; regulated egg harvest at Ostional coexists with strict protection elsewhere, while trawl bycatch — answered by turtle excluder devices — and coastal development press the big rookeries.
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