Smartphone Animal Guessing Game

Teachers, here is a game that you can get your ESL students to play in pairs in class with their smartphones. 

Student A goes to this page: roadtogrammar.com/rp/1a 
Student B goes to this page: roadtogrammar.com/rp/1b 

They will be shown a picture of an animal which their partner must guess by asking YES/NO questions. They also have to guess their partner's animal.The one who takes the least amount of guesses wins. They can then click the picture to get a new animal and play again.  
Screenshot: