Algodoo

Not exactly a murmuration, but close to it with only three birds instead of many hundreds of birds. Also, a murmuration IRL has many degrees of freedom. That is, the flock moves as a single mass in many different directions including left, right, up, down, forward, and backward. The flock can also change shape as if it were a cloud of smoke as observed from a distance. It is one of nature's many interesting phenomena!

Murmuration definition: A murmuration is a large, synchronized flock of birds, primarily starlings, that twist and swoop through the sky in shifting, wave-like patterns.