May I suggest going to the Transport Canada website
Transport Canada / Transports Canada and look for the book Sharing the Skies. You can download the PDF files and read them. The book clearly states that based on numerous inquiries with leading biologists in the field of bird strikes, along with research of peer reviewed papers that ther is NO evidence that aircraft radar is detected or understood as a threat by birds.
This remains one of the biggest urban myths in aviation along with the thoughts that birds cannot be effectively managed for substantial risk reduction.
I suggest reading the book will give you a better understanding of the problem and what can be done.