You may know that some bird species do not build nests. Example: some cuckoos are brood parasites, laying their eggs in the nests of other species. Other birds like terns and nightjars nest on bare ground.
In Singapore, if you are lucky, you can observe Little terns, Black-napped terns and Large-tailed nightjars nesting in the most in hospitable places. Here are some photos from the recent nesting season of the black-napped terns and large-tailed nightjars.
A lone chick day old chick that was beside another egg that hasn't hatched on a wet thundery morning.
Proud parent with its newly hatched chicks, attempting to feed one with a freshly caught fish. The obvious disadvantage of such open colony nesting is predation by humans and other birds and chicks drowning if they fall into the sea.
Mother Nature made these nocturnal birds masters of camouflage. However, being in distinguishable from your surroundings could also mean certain death under the foot of any unsuspecting person. Adults can fly off but young chicks have no way of avoiding a foot coming down on them..