It's still logically consistent if I claim that ducks have mammary glands, and any duck to the contrary has had them surgically removed by the government. You

It's still logically consistent if I claim that ducks have mammary glands, and any duck to the contrary has had them surgically removed by the government. You hand me an egg to put in my own incubator and raise myself? Well someone swapped the duck while I wasn't looking before the mammary glands developed.