To begin with, this is not the only one Orthodox miracle of Virgin Mary. She makes many miracles, to whoever truly believes in God. (Note: The Orthodox do not worship the Virgin Mary-worship is do to God alone, but she's highly praised).
She can protect us, she can cure our deseases, and also she can appears to whoever has pure heart..So whatever happens to our lives we don't have to panic but to trust God and pray to Virgin Mary in order to help us.
The phenomenon of the Holy Snakes of the Virgin Mary has been occurring for centuries during the festivities to the Theotokos between August 5 and August 15 in the village of Markopoulo on the island of Kefalonia, Greece. The small black snakes appear at the church of Panagia of Langouvarda on the site of a monastery, established as a nunnery and dedicated to Our Lady of Langouvarda.
The snakes have a small cross on their head and their tongues are also in the shape of a cross. They are known to belong to the Telescopus fallax species, also known as the European Cat Snake, and they appear in and around the courtyard of the church, on the walls and on the bell tower. The snakes show no fear while the services are held and are harmless during the festivities. As soon as the Liturgy concludes on the 15th of August, they become hostile and aggressive and disappear back into the wilderness of the area. The snakes cannot be found until the following year.