Graham's (9 years old) first Python program - Classifying animals

animals.py

"""
Required Attributes:

1. Vertabrate or Invertebrate
2. Fur or No Fur
3. Feathers or No Feathers
4. Gills or No gills
5. Scales or No Scales
"""
class Attributes:
    # True = Vertabrate
    # False = Invertabrate
    has_backone = False
    has_fur = False
    has_feathers = False
    has_gills = False
    has_scales = False
    has_legs_on_head = False


# Mammal
class Dog(Attributes):
    def __init__(self):
        self.name = 'Dog'
        self.has_backone = True
        self.has_fur = True

# Bird
class Chicken(Attributes):
    def __init__(self):
        self.name ="Chicken" 
        self.has_backone = True
        self.has_feathers = True

# Reptile
class Iguana(Attributes):
    def __init__(self):
        self. name = "Iguana"
        self.has_backone = True
        self.has_scales = True


# Fish
class Shark(Attributes):
    def __init__(self):
        self.name ="Shark"
        self.has_backone = True
        self.has_gills = True

class Octopus(Attributes):
    def __init__(self):
        self.name = "Octopus"
        self.has_gills = True
        self.has_legs_on_head = True

# Arthropod
class Crab(Attributes):
    def __init__(self):
        self.name="Crab"  
        self.has_gills = True

class Spider(Attributes):
    def __init__(self):
        self.name="Spider"

class Shrimp(Attributes):
    def __init__(self):
        self.name = 'Shrimp'
        self.has_gills = True

class Frog(Attributes):
    def __init__(self):
        self.name = 'Frog'
        self.has_backone = True
        self.has_gills = 'sometimes'

animals = [
    Dog(),
    Chicken(),
    Iguana(),
    Shark(),
    Octopus(),
    Crab(),
    Spider(),
    Shrimp(),
    Frog(),
]

for animal in animals:
    if animal.has_backone:
        # vertabrate
        if animal.has_fur:
            print(f'{animal.name} is mammal')
        elif animal.has_feathers:
            print(f'{animal.name} is bird')
        elif animal.has_gills:
            if animal.has_gills == 'sometimes':
                print(f'{animal.name} is amphibian')
            else:
                print(f'{animal.name} is fish')
        else:
            print(f'{animal.name} is reptile')
    else:
        # invertabrate
        if animal.has_legs_on_head:
            print(f'{animal.name} is cephalopod')
        else:
            print(f'{animal.name} is arthropod')