What does "all" mean here?
Native speaker’s answer
Rebecca
The word "all" in this case means "the only thing". So here, this means that one of the penguins slipping is the only thing the bird needs to catch one of them. Here's a few examples of the word "all" in similar contexts: Ex: All I need to do is to lock the door and then we can leave. Ex: My dog is all I need to be happy.