I strongly suspect they never witnessed it. Stories are told of experiments and observations of dolphins, sea lions, parrots, dogs, etc. It means, essentially, similarity. Both of these are obviously created objects, both even by different creators. But, they are loaded with homologous structures.
All time pieces are very similar, all computers, all chairs, knives, airplanes, etc.
There are several reasons for this. Everything is based on the knowledge they acquired from others. Thus, nearly every creation is very similar to things the creator has either made or observed before. The reason seems to be that human creators reason by analogy. Thus, when we set out to build, say a means of transportation, we utilize as much as we can, what we have learned from other vehicles.