If you ever rode regularly with a large group of bicyclists, you have probably have done the same or will do the same as you gain more experience.

It comes naturally because you want to avoid a direct head wind. Granted it does not take the full shape of birds of fish, but on a 2-D level it is a similar process.

Granted, I am ignoring the impact of traffic and roads that are narrow. Without either I think a large group of cyclists will form a V pattern similar to geese.

That's a really cool connection, and even the Wikipedia article mentions the similarity to birds. https://en.wikipedia.org/wiki/Peloton#Formations

It doesn't mention V shapes, though. I guess since a cyclist isn't generating lift, there are no wingtip vortices to exploit by forming such a shape.

> The shape or formation of the peloton changes according to multiple factors. Comparatively high power output efforts due to high-speeds on flat topography, a strong headwind or inclines (hills) tends to spread out or lengthen the formation, often into single file. A slow pace or brisk tailwind in which cyclists' power outputs are low result in compact formations such that riders ride side-by-side, often filling roads from one side to the other.