Migrating starlings fly in a formation near the southern Israeli town of Rahat February 2, 2015. The phenomenon, known as murmuration, is most common during the winter months. (Photo by Nir Elias/Reuters)

Migrating starlings fly in formation across the sky near the southern Israeli town of Rahat February 2, 2015. (Photo by Nir Elias/Reuters)

Migrating starlings fly in formation across the sky near the southern Israeli town of Rahat February 2, 2015. (Photo by Nir Elias/Reuters)

Migrating starlings fly in formation across the sky near the southern Israeli town of Rahat February 2, 2015. (Photo by Nir Elias/Reuters)

Migrating starlings fly in formation across the sky near the southern Israeli town of Rahat February 2, 2015. (Photo by Nir Elias/Reuters)

Migrating starlings fly across the sky during sunset near the southern Israeli town of Rahat February 2, 2015. (Photo by Nir Elias/Reuters)

Migrating starlings fly in formation across the sky over the southern Israeli town of Rahat February 2, 2015. (Photo by Nir Elias/Reuters)

Migrating starlings fly in formation across the sky near the southern Israeli town of Rahat February 2, 2015. (Photo by Nir Elias/Reuters)

Migrating starlings fly in a formation near the southern Israeli town of Rahat February 2, 2015. (Photo by Nir Elias/Reuters)

Migrating starlings fly in formation near the southern Israeli town of Rahat February 2, 2015. (Photo by Nir Elias/Reuters)