From Steve Glenn, a follow-up to a discussion we were having on Sunday:
There was some question from Sunday regarding whether bald eagles produce pellets. I couldn’t think of any reason why they couldn’t – and neither could Dorrie or Erin – but I came home and checked some references: they do.
A paper that has some good information on Bald Eagles and the analysis of their pellets is Mersmann, T. et al (1992) Assessing bias in studies of bald eagle food habits. /Journal of Wildlife Management/ vol. 56, 1.
Although studies of bald eagle (Haliaeetus leucocephalus) food habits are numerous, few authors have quantified biases inherent in the techniques used. In our study of food habits of nonbreeding bald eagles on the northern Chesapeake Bay, we examined biases associated with pellet analysis, food remains analysis, and direct observation. We assessed these biases through controlled feedings of 2 captive bald eagles and through observations of free-ranging eagles. Fish fed to 2 captive bald eagles were underrepresented (P < 0.001) in egested pellets. Most bird and mammal food items were detected in ≥1 pellet; however, species and carcass condition affected frequency of occurrence …/