With legs, probably soft bodied worms .
a russian dog and the first animal to orbit the earth ( first animal to go on the moon ) * * * * * Laika (Lyka?) did not go to the moon.
The earliest organism in Earth's fossil record that qualifies as an "animal" is likely a 760 million year old microscopic sponge Otavia antiqua discovered in African rock.
No. The smallest animal (mammal) on earth alive today is The Shrew.
There are numerous reasons why a pig might not be able to walk. The animal could be suffering from foot rot, iron deficiency, over weight, or another muscular disease. If the animal cannot walk, it is best to call your veterinarian for further diagnostic and treatment.
The Blue Whale is the largest animal living on Earth.
Neil Armstrong was the first animal to walk on the moon.
the first animal on the earth is a Dinosaur's
land mammal
An elephant is the largest mammal on land.
The only animal has been man.
Dinosaurs
According to the bible, the first person to walk on earth was Adam, followed by Eve.
the blue whale (answer by karl )
unicellular animal.
The largest animal ever is the blue whale ...although it didn't quite walk on earth. http://en.wikipedia.org/wiki/Largest_organisms
bacteria
in 1957 laika was the first animal to orbit the earth