What is the fine-grained topic of the following text: But no matter that the birds were “resourceful,” “attentive,” “creative” and “eager to participate,” or that they created fantastically scary beings such as a Gnashing Grapplesaurus, a Bristling Fang-Mangler and a Slimy Long-toed Zapper --- the monster would not be chased away. Only return the topic.
Birds creating imaginary monsters