RHE_THS and mjrb4, Thank you both very much for explaining why the addObject lines were not working and how to fix it. This is a problem I had in several scenarios. I'll change it into a loop. The 700 was trying to debug, to see if it would solve the problem. I'll go and fix the case problem too. Thanks.

hi RHE_THS thanks. sorry. I meant to publish the code. The default is not-published. Now it is published. Here is the code public TestWorld() { // Create a new world with 20x20 cells with a cell size of 10x10 pixels. super(800, 300, 1); Bird bird = new Bird(); addObject(bird, Greenfoot.getRandomNumber(800), Greenfoot.getRandomNumber(400)); addObject(bird, Greenfoot.getRandomNumber(700), Greenfoot.getRandomNumber(400)); addObject(bird, Greenfoot.getRandomNumber(800), Greenfoot.getRandomNumber(400)); addObject(bird, Greenfoot.getRandomNumber(800), Greenfoot.getRandomNumber(400)); addObject(bird, Greenfoot.getRandomNumber(800), Greenfoot.getRandomNumber(400));

I am confused about how getRandomNumber works. I thought my code would add 5 objects, but it adds only one. Why is that? Also, it seems like getRandomNumber does not get a new number sometimes, but just uses the same number you got before.