Spring migration begins as birds return to Switzerland from the Mediterranean

The first migratory birds have arrived in Switzerland after spending the winter in warmer regions. Ornithologists report an increase in sightings, marking the start of the spring migration season.

Recent data from the observation platform ornitho.ch shows a noticeable rise in starlings and song thrushes. These species, which typically winter in the Mediterranean, are among the earliest to return. Their arrival follows an innate biological rhythm linked to daylight changes.

The Swiss Ornithological Institute's bird migration radar has also picked up more nocturnal activity. Many short-distance migrants, such as red kites, are already back, with some appearing as early as late February. Others, like little bitterns and sedge warblers, are expected around mid-May.

Not all birds return at once. Males often arrive before females, spreading out the migration over weeks. This year, colder conditions in the north have kept unusual winter visitors, such as smews and red-necked grebes, in Switzerland longer than usual.

The surge in bird sightings confirms the migration season is underway. Short-distance migrants from the Mediterranean lead the way, while long-distance travellers from Africa will follow later. Observers expect further increases as spring progresses.