Levi's solution

features/animal.feature

@@ -1 +1,11 @@
-#Create your feature here
+Feature: Animal
+  In order to properly track my hotel's clientele
+  As a hotel manager
+  I want to be able to verify their names, types, ages, and whether they are old
+
+  Scenario: Chinchilla
+    Given a chinchilla named Spike who is 4 years old
+    Then its type should be chinchilla
+    And its name should be Spike
+    And its age should be 4
+    And it should be old

features/step_definitions/animal_steps.rb

@@ -1 +1,19 @@
-#Delete this comment, here is where you should write your step defs
+Given(/^a (.*?) named (.*?) who is (\d+) years old$/) do |type, name, age|
+  @animal = Animal.new(name, type, age.to_i)
+end
+
+Then(/^its type should be (.*?)$/) do |type|
+  expect(@animal.type).to eq type
+end
+
+Then(/^its name should be (.*?)$/) do |name|
+  expect(@animal.name).to eq name
+end
+
+Then(/^its age should be (\d+)$/) do |age|
+  expect(@animal.age).to eq age.to_i
+end
+
+Then(/^it should be old$/) do
+  expect(@animal.old?).to be true
+end