1. Male Caucasian Black Cocks do not use vocal songs on their leks. Instead they produce mainly low amplitude instrumental sounds.

2. LEKS GROUP AD uvoz i prodaja Aspiratora, ugradnih aparata i sudopera.Ovlaščeni zastupnik za Bugarsku,Srbiju,Crnu goru,Kosovo i Makedoniju za svetske lidere Faber i Nardi.