migration

An Arctic tern chick hatches in Greenland, fledges, and within weeks makes its first 70,000 km round-trip migration to Antarctica — a journey it has never made before, with no experienced adult to follow. By the end of its 30-year life, it will have flown the equivalent of three trips to the Moon and back. The mechanisms behind this feat involve quantum physics, internal clocks, and a navigation system more sophisticated than anything human engineers have yet replicated.

A bar-tailed godwit flies 11,000 km non-stop from Alaska to New Zealand. How animals navigate across hemispheres remains one of biology's great mysteries.

Chad and Somalia have the world's highest birth rates at approximately 6.0 children per woman. Sub-Saharan Africa dominates the top 20. Meanwhile Europe and East Asia face demographic contraction below 1.5. The gap between the world's fastest-growing and fastest-shrinking populations is the largest in recorded history — with consequences for migration, economics, and geopolitics that are only beginning.

Turkey hosts more refugees than any country — 3.6 million registered Syrian refugees. Germany hosts the most in Europe with 2.2 million refugees. Iran and Pakistan each host over 3 million Afghan refugees. The global refugee population exceeded 35 million in 2024 — the highest ever recorded.

India, China, and North Korea have the largest populations in modern slavery. The ILO estimates 50 million people are in forced labour or forced marriage globally. Thailand and Mexico are major transit and destination countries. The Gulf's kafala sponsorship system has enabled widespread labour exploitation.

India received an estimated $120 billion in remittances in 2023 and $129 billion in 2024, the most of any country. Here is the full ranking by dollars and by share of GDP, what drives it, and why the numbers disagree.

The United States sends $68 billion in remittances annually — the world's largest source. India receives $125 billion — the world's largest recipient. Global remittances total over $860 billion, exceeding foreign direct investment to developing countries. Here's who sends and receives, and why the cost of sending money across borders is still too high.

Germany received 351,000 new asylum applications in 2023 — the most of any country. The US received 620,000 but most are processed differently. UNHCR counts 117 million forcibly displaced people globally — the highest ever recorded. Here's who receives the most asylum seekers and what determines where people flee.

Iran hosts nearly 3.5 million refugees — the most of any country. Turkey hosts 2.9 million. Germany leads Europe with 2.6 million. Contrary to popular perception, the majority of the world's refugees are hosted not by wealthy Western nations but by low- and middle-income countries neighbouring conflict zones.