Well, the JP movies do propose a possible
cause for non-avian dinosaur extinction:
noise.
Every damned animal in all of those movies makes
a frightful racket at all times. All they need to do
is move, and they start squawking or squalling.
Even their >walking< sounds like pile-drivers,
though anyone observing such organisms as
elephants knows how quiet a large animal can be
in walking.
Pursuant to the JP movies, my current theory
regarding the aforementioned extinction is that the
dinosaurs made so much noise that 1) the herbivores
couldn't evade the predators, and 2) the predators
starved to death after warning all remaining prey
of their approach far in advance by snorking and
trumpeting like Ted Kennedy on the Senate floor.