mrswdk wrote:How would we know?
We can know. More or less. Whales have the unique situation of living in a medium that supports a significant amount of weight as long as it is less dense than seawater. Land animals don't have that ability. Flesh eaters also have the problem of needing to be able to actually catch their prey.
That leaves a whole lot of other interesting unknowns, for example, if dinosaurs had feathers. If they were as colorful as tropical birds are today.
