Class property derived from (abstract) class properties

Question

On an abstract class, in Python 3.6+, I'm trying to define a class property that is derived from other (abstract) class properties.

What I've tried:

from abc import abstractmethod

class AbstractAnimal:
    
    @classmethod
    @property
    @abstractmethod
    def front_limbs(cls):
        raise NotImplementedError
    
    @classmethod
    @property
    @abstractmethod
    def back_limbs(cls):
        raise NotImplementedError
    
    @classmethod
    @property
    def limbs(cls):
        return [cls.front_limbs, cls.back_limbs]
    
class Monkey(AbstractAnimal):
    front_limbs = 'arms'
    back_limbs = 'legs'

print(Monkey.front_limbs)
print(Monkey.back_limbs)
print(Monkey.limbs)

I expect/desire:

arms
legs
[arms, legs]

I get:

arms
legs
<bound method ? of <class '__main__.Monkey'>>

I tried looking at previous questions, as this feels pretty basic, but none of them discussed derived class properties (this one, for example, helped me with abstract properties to begin with).