input: Write a python function to classify an animal as "Mammal" or "Reptile" based on a list of features.
  assert classify_animal([0, 1, 1, 0, 1]) == "Mammal"
  assert classify_animal([1, 0, 0, 1, 0]) == "Reptile"
  assert classify_animal([0, 1, 1, 1, 0]) == "Reptile"
  assert classify_animal([0, 1, 1, 0, 0]) == "Mammal"
output: def classify_animal(features):
      # Example rule-based classification
      if features[0] == 0 and features[1] == 1 and features[2] == 1 and features[3] == 0:
          return "Mammal"
      return "Reptile"