What was Rikki-tikki-tavi's greatest challenge?

Do snakes have pits? Who observed variations in the characteristics of animals and plants on the islands of Galapagos? What happened to shamu after the attack in 2010? What is an alligator a mammal or what? What is the bird of dawning? Why does your cat meow incessantly when she is in the car with you? How many feet does a spider have? What is the offspring of a cow and a bull called? How do animals capture energy from the sun? Giving dogs mylanta for upset stomach? Are snakes attracted to oleander plants? American fuzzy lop? What is wrong with an Oscar you've had for a week if he won't let you get near him and he swims away when you drop in pellets and he'll eat but not near you and hides in his cave or tree? What is north carolinas state animal? What two dog breeds make a jug? What does a cling fish do to protect itself from being eaten? What is the offspring of a moose? How does the cow get energy from the sunlight? Can blackcat die by black mold? African reed frogs?