The human voices that start around the 3:07 mark are a distorted sample of the Azan/Adhan or the Islamic call to prayer, probably this one in particular: https://youtu.be/wvzVgidWrDM?t=49
Trivia
Apart from being the most colourful feature of the peacock, it was also a figure used by Euclid to prove the Pythagorean theorem.[1]
The NBC Peacock, one of the most famous TV station logo in the USA, features the colours of the rainbow. Rainbows are frequently referenced in Boards of Canada's music (see: Roygbiv on MHTRTC)