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IP over Avian Carriers with Quality of Service https://www.rfc-editor.org/rfc/rfc2549

It's even been updated[1] for IPv6, so no reason not to use it!

For anyone who wants to explore further, Wikipedia has a list page for these RFCs: https://en.wikipedia.org/wiki/April_Fools%27_Day_Request_for...

There are a lot more of them than I had realized before finding that. Some years even had multiple.