Scientists digging in Poland found footprints of a supposed early land animal. They were surprised to find the footprints showed the animal was much more developed than they expected.
They expected to find extra strong paired fins of an animal whose parents had been fish. But what they found had fully developed toe digits. Further, the trail of footprints showed the animal had true legs, not super-fish-fins-on-their-way-to-developing-into-legs. And also of note, the footprints may indicate that if this animals ancestors were indeed water-dwellers, they dwelled in saltwater, not the fresh water scientists had hypothesized for the first transitional form of land animal. Even more puzzling is that the time frame is off: the date for these animals is earlier than they expected.
I guess they’ll have to re-think their theory just a bit.