do dinosaurs still exist?

Are there dinosaurs still alive on the earth? I guess it may depend on the definition of dinosaur. But I don't care about the definition. I prefer to put the etymology on here:

1841, coined by Sir Richard Owen, from Gk. deinos "terrible" + sauros "lizard,"
of unknown origin. Fig. sense of "person or institution not adapting to change"
is from 1952.

So of course most dinosaurs went extinct many millions of years ago, and people didn't inhabit the earth until may fewer millions of years ago. (I personally kind of wonder if the fossils of people and dinosaurs may have come from bits of other planets, thus their extreme old age, but that is the subject of another blog post.) That makes people want to say that people and dinosaurs have never inhabited the earth at the same time. But did every single living thing classified as "dinosaur" go extinct, or are there still some that have survived millions of years of changes on the earth?

This is what the great oracle Wikipedia has to say about it:

Living dinosaurs is a term sometimes used to denote birds, which are the only
clade [branch] of dinosaurs, other than a controversial group of fossils
known as Paleocene dinosaurs [which might have lived into the Paleocene age], to have
survived the Cretaceous-Tertiary extinction event. The term is also used for
extinct species of dinosaurs that are claimed to exist today, a belief which is
unsupported by scientific research.

The belief in surviving non-avian dinosaurs is called cryptozoology. Some people claim that the following are dinosaurs alive today (info taken from various Wikipedia and tangential pages):

• Kasai rex is supposedly a carnivorous dinosaur living in Africa. It is said to look like a larger version of this:
  
• Mbielu-Mbielu-Mbielu (my favorite name) is reported from the Republic of the Congo. Apparently herbivorous, it is described as "the animal with planks growing out of its back." It appears to be aquatic, and has mostly green algal growth covering the "planks".


• Muhuru is an alleged relict non-avian dinosaur that has been reported from the jungles of Kenya.It is described as a heavily-armoured beast with thick bone plates on its back and tail spikes.
  
  
• According to the traditions of the Congo River basin the Mokèlé-mbèmbé is a large territorial herbivore, approximately the size of a small elephant or a large hippopotamus. It is said to dwell in Lake Télé and the surrounding area, with a preference for deep water, and with local folklore holding that its haunts of choice are river bends.



• The Emela-ntouka is claimed to be around the size of an African Bush Elephant, brownish to gray in color, with a heavy tail, and with a body of similar shape and appearance to a rhinoceros, including one long horn on its snout. Keeping its massive bulky body above ground level supposedly requires four short, stump-like legs. It is described as having no frills or ridges along the neck. The animal is alleged to be semi-aquatic and feeds on Malombo and other leafy plants. The Emela-ntouka is claimed to utter a vocalization, described as a snort, rumble or growl.