otseng
Sure, there existed small animals as well as very large ones. But, we don't see very large land animals now as we do in the fossil record. I don't think this is disputable.
Such as:
42 ft snake
one ton rat
10 pound frog
5 ft penguin
8 ft sea scorpion
50 ft shark
1000 pound sloth
I dispute it.
42 foot snake-I think the biggest current snakes only stretch about 35 feet, but there is no reason that bigger ones could not exist.
One ton rat-How much does a hippopotimus weight?
10 pound frog-You mean like this one?
5 ft penguin-9 foot Ostrich...
8 ft sea scorpion-Now there you have to take into account the competition. When the 8 foot scorpion existed it was the top of the food chain. But when fish and other competitors came along it quickly became extinct. Lobsters still reach 41 inches and 44 pounds.
50 ft shark-The winner of the title of the Largest Ocean Carnivore goes to the Sperm whale. The largest of the toothed whale species in the world. Adult males can grow up to 60 feet long and weigh 40 tons (read - 80,000 pounds!).
http://www.extremescience.com/sperm-whale.htm
1000 pound sloth-The polar bear has an average weight of 900 to 1,500 pounds and is considered the world's largest bear with the brown bear, averaging 500 to 900 pounds a close second.
The largest polar bear ever recorded was shot in Kotzebue Sound, Alaska in 1960 weighing a grizzly 1002 kilograms or 2,210 pounds and stood 11 feet 11 inches in height.
The largest brown bear, a Kodiak bear, which is a subspecies of the brown bear, weighed in at over 2,500 pounds and was almost 14 feet tall.
http://thelongestlistofthelongeststuffa ... est12.html
Just because there were large animals in the past(some larger than any seen since)does not mean that the average size of fauna has increased or decreased. Just a few thousand years ago there were flat faced bears(the cave bears), saber toothed tigers, mammoths, sloths and vast herds of bison roaming North America, then along came man who hunted them into extinction. In South America 10 foot flightless birds of prey ruled.
There are times when some large animals gained a reproductive advantage by growing to great size, but some of the biggest animals EVER exist today. There was nothing magical or different in past ages, the world has been hotter and it has been colder many times over the history of life on Earth. There has been times of higher oxygen content and times of lower. What we do not see is any kind of "uniform" climate over the whole planet.
Grumpy
