Swallows in Deadly Oasis In The Sahara Desert | Africa | BBC – https://www.youtube.com/watch?v=lPWEKUQLb9Y

Birds sleep with half brain off and rest on – https://www.independent.co.uk/news/birds-sleep-with-half-brain-off-and-rest-on-1068533.html

David Attenborough On God – https://youtu.be/mI7f3xVgZdA