the main threat to their survival is...you guessed it...humans! now that the price is a lot more reasonable! many customers want to know the real-time location of their own goods. i thought it tied in nicely with my spider sticker. try and compete with this at your peril. wish i can take photos like this! if you like it, please buy the full version to support the developer, thanks. you never know when this balloon will boom! i do a decent amount of reading but rarely post. 