The world of dinosaurs got its maximal wealth and diversity in the Late Cretaceous.
Among
these creatures were the large and tiny, predatory and herbivorous,
bi-pedal and
quadripedal, fast runners and semi-aquatic giants.
Altogether they occupied and
dominated almost all available ecological niches.
Nevertheless, the time of their
flourishing became a beginning of a time of decline.
Mammals would soon become
the new ruling inhabitants of the Earth.
This next era in the evolution of terrestrial
tetrapods did not provide any place
for the dinosaurs.