No bulldozers push stuff around like mulch. Tractors are diffrent you can have tractor trailors or farming tractors. Farming tractors can do anything from Spreading seeds to watering them.
Yes, that statement is generally true.
If you are interested in purchasing John Deere toy tractors, they have numerous types available. They have bulldozers, dump trucks and large farming tractors.
A trollip of tractors
They classify tractors by there housepower which is measured by somthing called a dyno.
Larger and multiple tires and tracks keep the vehicles from sinking into the mud by reducing the pressure on the ground by spreading the weight of the vehicle over a larger area.
The fuel used in bulldozers is diesel.
Bulldozers are used for clearing land, moving dirt, etc
There are many different types of businesses that sell bulldozers to their customers. The pricing of the bulldozers depends on the usage and how many days you are using it.
once upon a forest? http://en.wikipedia.org/wiki/Once_Upon_A_Forest
They appeared as early as 1929, but were known as "bull grader" blades. The early ones were adapted from farm tractors that were used to plow fields. In the mid 1930's they became known as "bulldozer".
One can find Farmall tractors for sale on eBay which has different deals on these products from different locations. One can also find the tractors on a website called USFarmer.