jm << If this is so, then why do we not see this happening today? Why do wolves not give birth to dogs today? Why do lions not give birth to cats? Why do the great apes not give birth to human children? >>
Wolves give birth to very slightly different kinds of wolves, over hundreds of millions of years, with thousands or millions of these wolves in a population, some of them slowly changing and becoming more and more dog-like. I should add: with humans being a major factor in their evolution by domesticating and breeding them about 14,000 years ago. Another thing to tack on: At the molecular level not much changed at all: The DNA makeup of wolves and dogs is almost identical (from the article below).
From Wolf to Woof: The Evolution of Dogs
Another set of these wild wolves began to slowly adapt to life back in the water, finally these, after millions of years of small changes, gave birth to whales about 50 million years ago. Between the wolf-like or cow-like
Artiodactyls or Mesonychids and the whale, are the semi-whales with legs (ambulocetus). It just takes much time, populations, and reasons for change (more food in the water, etc), from my limited understanding how evolution works.
Whale Evolution from PBS Evolution
Origin of Whales from TalkOrigins
How do we know this transition happenend? Because they have the transitionals:
http://www.bringyou.to/apologetics/Ambulocetus.jpg
Q: Where was Ambulocetus found? A: Ambulocetus has been found in Pakistan, which would have been on the shores of the Tethys sea separating the European archipelago from Africa and Asia.
Q: How big was Ambulocetus? A: Ambulocetus was 3m long, which is bigger than many crocodiles.
Q: How do we know that Ambulocetus is an early form of whale? A: Ambulocetus’ teeth and skull structure shows that it is a whale. Many other fossils have been found showing early whales with varying sizes of leg and tail (e.g. Pakicetus, Rodhocetus, Dorudon, and the already well known Basilosaurus). The teeth of all of them, including those which were fully aquatic, are very similar, as are their ear structures. Whales separate their ears from the skull – they “float” in a region of fat. To get sound to the ear, modern whales have a partially hollow jaw that is filled with a special type of fat. When sound waves hit the jaw they are conducted through the fat to a thin bone connection to the ear from the back of the jaw. This thin bone connection has a characteristic “S” shape that is totally unique to the whales, and has proved to be so remarkable to paleontologists over the last two decades. Ambulocetus already had the S-shaped ear bone and had jaws that would have been packed with sound-conducting fat, despite the fact that they seemed to live mostly on land. This implies that the strange way of hearing had initially evolved not for hearing underwater, but for some other purpose (e.g. sensing prey on land).
Q: How do we know that Ambulocetus lived in water as well as on land? A: Its long body is shaped rather like an otter, with a broad flattened tail and paddle-like hands and feet. The back legs are very short and strong and would have been powerful in the water, but clumsy on land. All these features suggest that it was a good swimmer, and easily capable of moving on land as well.
As for ape-like creatures to humans, that too took millions of years (about 6-10 million years ago are our earliest ancestors I understand). No ape will give birth to a human, that would be a refutation of evolution.
Phil P
Don’t get me started on global warming, I’m one of those who did a little research on it, and am coming to understand there is a 
