Done(Panda, Tiger, Eagle)

[var114]

No description provided.

[jwo]

In RSpec, it has cool matchers that I like to point out. You could rewrite this methot as:

Vehicle.wheels.should be_nil

[jwo]

Looks pretty great!

The only thing I wasn't 100% on was the self.wheels --- In it, you are setting a variable and returning it.

class Vehicle
  @@wheels = 0

  def self.wheels
    @@wheels
  end
end

Then in your motorcycle, you can override the @@wheels

class Motorcylcle < Vehicle
  @@wheels = 2
end

Vehicle.wheels
=> 0

Motorcycle.wheels
=> 2

OR, possibly event simpler (but without using class variables):

class Vehicle
  WHEEL_COUNT = 0

  def self.wheels
    WHEEL_COUNT
  end
end
class Motorcycle < Vehicle
  WHEEL_COUNT = 2
end

puts Motorcycle.wheels
=> 2