Some of these little creatures aren't what they seem at first glance. You might notice a spider and scream for help but it turns out, it's absolutely harmless. On the contrary, some fellas are tiny and cute, but pretty dangerous for humans or animals. So don't judge those books by their covers.
For example, Australian thorny dragons are pretty scary-looking. They look like tiny dragons ready to destroy any obstacle or enemy on their way with fire. However, they won't ever attack a human and they actually use those spikes to protect themselves against predators.