Deadly Oasis In The Sahara Desert
I can't imagine how hard it is to travel in a deserted place, then you are very thirsty because you don't have a water anymore and then suddenly you feel happy because you found a water only to find out that there is a major problem about the water so you can't drink it like you are expecting, so disappointment takes all over your sudden happiness. Those birds are lucky enough because they have a second solution about the water problem. But, if they are people I don't think they would like to eat those flies too in order to solve their dehydration.