With all due respect anyone and there brother can pull up websites that support their positions on any argument. The real trick is understanding what
you are saying.
You have pointed to Whale evolution as a form of transitional fossil. Lets review shall we? Ambulocetus Natans is an alleged transitional fossil
between Mesonychids, carnivorous, land-based mammals who varied in size from foxes to large wolves or bears, and modern whales, the toothed whales,
Odontoceti, and baleen whales, Mysticeti. Ambulocetus Natans is a species that is 7 feet long, however many
sites including
talkorigins.org refer to it as being 12 feet long so I will say it's 12 feet long for sake of any argument. The next step in the alleged evolution
tree is Rodhocetus which is only 10 feet long. Following Rodhocetus is Basilosaurus which is 70 feet long which again certain internet sites list
differently at 60 feet. So what we have here is minimum difference in size of 48 feet between Ambulocetus Natans and Basilosaurus (50 feet if you
want to go with Rodhocetus).
This is not descent with modification as proposed by evolution but rather a massive change in the species that evolution cannot account for (either in
the fossil records or in how such a species could evolve from a mother which could not bear it).
Wednesday, 19 September 2001 18:23 (ET)
Whale find shakes evolutionary theories
By LIDIA WASOWICZ, UPI Senior Science Writer
In findings that throw cold water on the two most popular theories of the
evolution of whales, researchers in the Punjab Province of Pakistan have
unearthed 50-million-year-old fossilized remains of the closest land
relatives of the giant mammals.
Expeditions to a scorching, rugged area halfway between the capital of
Islamabad and the Afghan border yielded nearly complete skeletons of two
whale ancestors, one the size of a modern-day fox, the other wolf-sized. In
their day, both animals sported land-friendly features -- long, spindly
legs, distinctive ankle bones -- seen in cows, pigs, sheep and other hoofed
mammals-as well as tiny ear bones found only in whales and other cetaceans,
scientists said in the British journal Nature.
Experts told United Press International they deem the find as significant
as that of the most primitive bird Archaeopteryx or of the early human
relative Australopithecus.
The discovery throws into question two predominant theories which hold
that whales are related to either hippopotamids, which number hippopotamuses
and pygmy hippos, or to mesonychians, an extinct group of meat-eating
mammals from the Northern Hemisphere that could be as small as a weasel or
as large as a grizzly bear.
The new findings instead suggest whales are closely related to a group of
mammals called even-toed ungulates or artiodactyls that include camels,
pigs, deer, cattle, peccaries, llamas, giraffes, goats, sheep and antelope.
The crucial evidence comes in the form of an anvil -- a bone about the size
of a handful of poppy seeds that is delicately suspended in the ear --
recovered from what is thought to be the first cetacean, dubbed Pakicetus,
which roamed Earth some 50 million years ago during the Eocene Epoch, said
lead author Hans Thewissen of Northeastern Ohio Universities College of
Medicine in Rootstown, Ohio.
"Hearing is one of the most fascinating parts of early whale evolution;
these early whales are really experimenting with different hearing systems.
We don't know all the details, but it seems that they may have listened the
way crocodiles do, pushing their lower jaw into the ground and picking up
vibrations of the footsteps of other prey animals," Thewissen told UPI.
"Maybe whales are doing the same thing."
The ear of modern whales and dolphins is specialized to listen to sounds
under water. Unlike the flat, translucent sheet of tissue that comprises the
eardrum in other mammals, the hearing organ in whales is a thick, opaque,
cord-like structure. All cetaceans have three small ear bones-the hammer,
anvil and stirrup-just as their land mammal ancestors did, though their
shape has been greatly modified over the ages. The hearing organ of Eocene
whales represents a compromise between adaptations aimed at receiving sounds
under water and holdovers from a system used for listening to air-borne
sounds, scientists said. The fossils "should take their place among other
famous intermediates such as the most primitive bird Archaeopteryx" and the
hominid Australopithecus, said Christian de Muizon of the Laboratoire de
Paleontologie at the Muséum National d'Histoire Naturelle in Paris, who
authored an accompanying News and Views article.
"These partial skeletons provide a good argument that cetaceans and
artiodactyls are closely related," de Muizon said in a telephone interview.
Thewissen, Ellen Williams and their team pieced together the skeletons of
two different whale species: the fox-sized Ichthyolestes pinfoldi and the
wolf-sized Pakicetus attocki. These are the oldest, most complete skeletons
of early whales found to date, they said. The bones point to a small
wolf-like body, but with a longer, muscular tail, a lengthier snout and
small eyes set close together on top of the head. Pakicetus lived on land
and likely fed while wading in shallow streams. The animals' anklebones
indicate "the earliest whales were good runners," de Muizon told UPI.
