Morse Code Generator

My fifth grade classes are partnered with a class in New Mexico for an exploration of communication forms. I am using this Communication Through the Ages Infographic as a starting point and a guide for our interactions. Our classes are exchanging type-written introduction letters to start (they are handwriting theirs), and I'm thinking about maybe making some cave-paintings to send as well. Next, we will be creating Morse Code messages to send using this translator. I'm not sure how we could simulate carrier pigeons or smoke signals without incurring the wrath of the fire martial and animal rights activists.