Please be specific on what type of carrying capacity you want to determine, As to your question there are models, linear programming vis a vis max-min models that can use secondary data. But overall it is best to undergo field work for a ground truth and a better perspective on your study.

Can you please clarify what you mean by types of carrying capacity? (please name some of them). I need the highest number of a specific bird that an area equal to home range size of that bird can support without damage to that environment.

so what you mean sir is population carrying capacity