Birds useful and birds harmful

"Birds Useful and Birds Harmful" by Ottó Herman is a guide that explores how different kinds of birds affect farming, rating them as either helpful or harmful. Set in the early 1900s, the book aims to help people understand the roles birds play in nature, particularly in keeping pests away and helping crops grow, with a focus on Hungary. The book states that studying birds and learning about their helpful and harmful qualities is key to understanding the economic effect of birds and the world around us, as well as the importance of protecting bird populations. It highlights how deciding if a bird is helpful or not can change depending on farming methods and what's happening in the environment.