Indri Indri singing, Mantadia 

The indri indri, also called the babakoto is one of the largest living lemurs, with a head-and-body length of about 64-72 cm (25-28 in) and a weight of between 6 to 9.5 kg (13 to 21 lb). It is vocal particularly in the morning and evening, and can be heard up to 3 km away