Mammals Facts:

The Biggest Mammal : The biggest mammal is the Blue Whale which can grow uo to 33m long and weigh up to 190 tones.
The Biggest Land Mammal: The biggest Land Mammal is the African bush Elephant which can grow up 4m tall and weigh up to 12 tonnes.
The Tallest Mammal: The tallest mammal is the Giraffe which can grow over 6m tall.
The Smallest Mammal: The smallest mammal is the Bumblebee bat of Thailand which weighs under 2g.
The Smallest Land Mammal: The smallest land mammal is the Etruscan shrew which is under 50mm long.
The Fastest sprinting Land Mammal: The fastest land mammal is the cheetah which can reach 100kmh for short bursts.
The Fastest Running Land Mammal: The fastest running land mammal over a sustained distance is the North American Pronghorn antelope, which can keep up 56kmh for over 6km.
The Fastest Marine Mammal: The fastest swimming mammal is the killer whale , which can reach 55kmh.
The highest jumper: The highest jumping animal are pumas and leopards which can jump over 5m into trees.
The Oldest Living Mammal: The oldest mammal(apart from humans, of course) is the elephant which can live 70 years.