WonderIsland ecology fact1,712 of 1,961

After the first wet-season rains, millions of red crabs migrate from Christmas Island's rainforest to the ocean, timing spawning with moon and tide.

Red crab migration

Why it matters

The idea in context

The migration looks theatrical, but its timing is practical and precise. Rain gives the land crabs enough moisture to travel; the lunar cycle helps set the spawning window before dawn on a receding high tide. Roads close, bridges guide the flow, and a whole island adjusts itself around a red tide of life moving from forest to water and back again.

Türkçe

Aynı kart, başka bir dilde.

İlk yağmurlardan sonra milyonlarca kırmızı yengeç, Christmas Adası'nın yağmur ormanından okyanusa göç eder; yumurtlama zamanını ay ve gelgitle ayarlar.

Kırmızı yengeç göçü

Göç tiyatral görünür, ama zamanlaması son derece pratik ve kesindir. Yağmur, kara yengeçlerine yolculuk için gereken nemi verir; ay döngüsü ise çekilen yüksek gelgitte, şafaktan önceki yumurtlama penceresini belirlemeye yardım eder. Yollar kapanır, köprüler akışı yönlendirir ve bütün ada, ormandan suya, sudan yeniden ormana giden kırmızı bir yaşam dalgasına göre kendini ayarlar.

Source trail

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Background reading: Christmas Island red crabAttribution and context are revised when stronger evidence appears. Corrections are welcome through the editorial page.

Open in the iPhone app Editorial method

Next in the open archiveThe Bantu migrations spread related languages, farming knowledge and iron-working across much of central, eastern and southern Africa over many centuries.Q1764

After the first wet-season rains, millions of red crabs migrate from Christmas Island's rainforest to the ocean, timing spawning with moon and tide.

The idea in context

Aynı kart, başka bir dilde.

Read beyond the card.

Keep following this thread.

Arctic terns migrate from Arctic breeding grounds toward Antarctic waters and back, chasing long daylight across the planet.

Across the Serengeti-Mara ecosystem, wildebeest and other grazers follow rain-fed pasture in a vast circular migration, with predators and landscapes moving to the same rhythm.

The whale pump describes how whales recycle nutrients through feeding, diving, migration and waste, helping stimulate phytoplankton at the ocean surface.

Grand Teton pronghorn migrate up to about 150 miles between summer and winter ranges, following ancient corridors now challenged by roads, fences and development.

South Africa's sardine run sends vast shoals north along the coast during winter cool-water conditions, drawing dolphins, gannets, sharks, seals and whales into one marine spectacle.