20 facts about Common cuckoo
They are known for their distinctive mating song, which resounds with the familiar "cuckoo" repeated in two or three syllables. Another interesting fe ...
Leeches, being eurytopic animals, are common on almost every continent. Although they usually lead a parasitic or predatory life, they have been used by humans for centuries for medicinal purposes. In the past, they were used for bloodletting, today, kept in sterile cultures, they support various medical therapies.