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What is the relationship between brain and body size??

Clearly different animals have differently sized brains. How important is brain size for behavior? Some people have thought that brain size is strongly related to intelligence. But, as you may have noticed, it also looks a bit like brain size may simply be bigger in bigger animals and smaller in smaller animals-- regardless of "intelligence".

On the next couple of pages will be a series of tables designed to help us visualize brain size in relation to body sizes and develop questions from that. The table below shows, on the left, brains whose apparent size is appropriate for the pictures on the right. Click on the pictures of the animals to read specific information about the species. Since the pictures on the right don't accurately show relative sizes of the animals, we can't conclude from this much about whether bigger animals have bigger brains.

 approx Human brain length=15cmapprox brain weight=1400g approx body length=100cmapprox body weight=62,000g approx Baboon brain length= 8cmapprox brain weight=140g approx body length=75cmapprox body weight=30,000g approx Monkey brain length=5cmapprox brain weight=100g approx body length=30cmapprox body weight=7,000g approx Camel brain length=15cmapprox brain weight=680g approx body length=200cmapprox body weight=529,000g approx brain weight=1700g approx body length=10 feetapprox body weight=160,000 g approx Kangaroo brain length=5cmapprox brain weight=56g approx body length=150cmapprox body weight=35,000g approx Cat brain length=5cmapprox brain weight=30g approx body length=60cmapprox body weight=3,300g approx Raccoon brain length=5.5cmapprox brain weight=39g approx body length=80cmapprox body weight=4,290g approx Rabbit brain length=5cmapprox brain weight=12g approx body length=30cmapprox body weight=2500g approx Squirrel brain length=3cmapprox brain weight=6g approx body length=20cmapprox body weight=900g approx Frog brain length=2cmapprox brain weight=0.1g approx body length=10-12cmapprox body weight=18g

The actual sizes of the animals and brains are given in this this chart. But it may be easier to do some comparisons by changing the size of the pictures . . .