Tinbergen researched on Herring Gulls and concluded the foolish behaviour of birds.
True
Herring Gull is a type of bird which hatches eggs on ground. Tinbergen experimented by placing a bigger and more glossy egg near the real ones. It was found that the parents came hurriedly to warm that fake egg leaving behind the real eggs. Similar experiments were conducted on other birds and he concluded the foolish behaviour of birds.