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....... more food availability for the large species.
Okay, so dinosaurs came in all sizes, but still, the largest land dinosaurs was much larger than the largest land mammals. Is it because huge warm-blooded land mammals would have difficulty getting rid of the heat they would generate? Whales can grow to huge sizes because they are in water, and water is a good heat sink as well as being able to support them physically.
So why no giant mammals? Perhaps for no other reason than they did not need great size.
I always wondered why insects didn't get bigger. Is an exoskeleton unstable beyond a certain size? Is their respiratory system not efficient enough to get oxygen to all the the tissues beyond a certain size? Well, anyway, I'm glad they didn't.