Land mammal:
African elephants weigh up to 14,000 pounds and can eat as much as 600 pounds of food a day!
Marine mammal:
The blue whale is the world's biggest animal, even larger than any known dinosaur. An average-sized adult is 24m long and weighs about 120 tons. This giant is also the loudest animal on Earth. Its call, which is louder than a jet, can be heard for hundreds of miles.
Bird:
The ostrich can grow up to 3m tall and weighs as much as 350 pounds. Its eggs, the largest of all birds, weigh up to three pounds.
Fish:
The whale shark, which is not a whale, reaches approximately 13.8m in length and weighs up to 15 tons.
Insect:
A giant walking stick can grow to about 55cm with its legs outstretched.
Reptile:
The saltwater crocodile can grow to 6.9m long.
Walking stick
As its name suggests, the stick insect resembles the twigs among which it lives, providing it with one of the most efficient natural camouflages on Earth. It and the equally inconspicuous leaf insect comprise the Phasmida order, of which there are approximately 3,000 species.
Stick insect species, often called walking sticks, range in size from the tiny, 11.6mm long Timema cristinae of North America, to the formidable 328-millimeter-long) Phobaeticus kirbyi of Borneo. This giant measures over 55cm with its legs outstretched, making it one of the world’s longest insects. Females are normally larger than males.
Walking sticks generally mimic their surroundings in colour, normally green or brown, although some species are brilliantly coloured and others
conspicuously striped. Many stick insects have wings, some spectacularly beautiful, while others resemble little more than a stump.
Many stick insects feign death to thwart predators and some will shed the occasional limb to escape an enemy’s grasp. Others swipe at predators with their spine-covered legs, while one North American species, Anisomorpha buprestoides, emits a rotten-smelling fluid.
http://www.factmonster.com/ipka/A0934316.htm
http://animals.nationalgeographic.com/animals/bugs/stick-insect.html