Morocco Bird Migration: The Strait of Gibraltar from the Moroccan Side

Around 300,000 raptors of nearly 30 species, plus some 150,000 storks, cross the Strait of Gibraltar every year, funneling through the 14-kilometre narrows between Africa and Europe. Almost every birding tour watches this from Tarifa, on the Spanish side. But in spring the birds gain height over the Moroccan headlands — Jbel Moussa and Cap Spartel — before they commit to the crossing, and almost nobody watches from here. This guide explains how to see the migration from the Moroccan side, when to come, what you'll see, and how it pairs with the Merja Zerga lagoon, one of the great wader wetlands of the East Atlantic Flyway.

I'm a Morocco specialist, not an ornithologist — but I've stood on the Jbel Moussa ridge on a good March morning with Black Kites streaming overhead in their thousands, and I've watched the Spanish side from across the water doing the same thing with bigger crowds. The birds don't carry passports. What follows is the practical, Moroccan-side version of a trip the birding world mostly runs from Spain.

Why do so many birds cross at the Strait of Gibraltar?

Because it's the shortest hop and the only one that works for soaring birds. The Strait is just 14 km wide at its narrowest, and raptors and storks depend on thermals — rising columns of warm air — to gain height and glide. Thermals form over land, not over open sea, so a wide sea crossing is exhausting and dangerous for a soaring bird. The result is a funnel: birds migrating between Europe and Africa converge on the narrowest crossing, which makes the Strait one of the top five raptor-migration sites on Earth.

When is the best time to see the raptor migration in Morocco?

Spring — mid-February to late March — is the peak for Black Kite, Short-toed and Booted Eagles and harriers crossing north into Europe. Early May brings the most concentrated spectacle of all: roughly 80% of the European Honey Buzzard population crosses in about nine days. The autumn return passage (late August to early October) is the other major window, weighted toward Honey Buzzard, storks and Egyptian Vulture heading south. For a Moroccan-side tour, spring is the headline season.

Where do you watch the migration from the Moroccan side?

The anchor is Jbel Moussa, one of the twin Pillars of Hercules and a BirdLife-designated Important Bird Area. It's a genuine migration bottleneck where spring passage can reach around 40,000 raptors plus tens of thousands of storks and Honey Buzzards. Birds gain height over the massif before they cross, so you watch them spiral up almost overhead. Cap Spartel, the headland west of Tangier where the Atlantic meets the Mediterranean, gives a second vantage and adds seabirds and gulls. Both are inside an easy drive of Tangier.

What is Merja Zerga and why visit it?

Merja Zerga, the lagoon at Moulay Bousselham about midway between Tangier and Rabat, is a Ramsar wetland and one of the most important wader sites on the East Atlantic Flyway. It holds 50,000–100,000 waders and 15,000–30,000 wintering ducks, with more than 100 species recorded. Local fishermen run boat trips on the lagoon (around €25 an hour) that get you close to Greater Flamingo, Marbled Teal, Marsh Owl, and Audouin's and Slender-billed Gulls. Morocco's Atlantic estuaries — Merja Zerga in the north, the Loukkos near Larache, and Souss-Massa far to the south near Agadir — are flamingo and wader strongholds in their own right, not just a footnote to the raptor crossing.

What does the Slender-billed Curlew have to do with Merja Zerga?

Merja Zerga is where the world last reliably saw a Slender-billed Curlew. The species was declared globally extinct by the IUCN in 2024 — the first known global extinction of a formerly widespread bird from Europe, North Africa and West Asia — and its last incontrovertible record anywhere on Earth was here, at Merja Zerga, on 25 February 1995. It's a sobering thing to stand on a lagoon that beautiful and know that. It's also part of why low-impact birding here matters: the wetland is a survivor, and it deserves to be treated like one.

How do you watch the migration ethically?

The serious-birder protocol, which any good guide will follow: no call playback to lure birds, no flushing flocks for a photograph, and no approaching nests or roosts. The raptor crossing and the Ramsar lagoon are sensitive sites, and the only birding worth doing here is the low-impact kind. The payoff is birds behaving naturally — a kettle of kites spiralling on a thermal, flamingos feeding undisturbed at dawn — which is the only version of the spectacle that's actually worth the trip.

If you want it guided, our Migration Birder tour runs the Moroccan side with a credentialed ornithologist — Jbel Moussa and Cap Spartel for the crossing, then the Merja Zerga lagoon by fisherman's boat — capped at six guests, no playback, with a pre-trip species checklist and loaner optics. It pairs naturally with our Strait cetacean tour from Tangier if you want whales and raptors on the same northern base.