Reply To: Fish Home › Forums › Kashruth › Fish › Reply To: Fish June 3, 2009 5:12 pm at 5:12 pm #1097506 aryehmParticipant Kosher mammals are primarily vegetarians. Kosher birds will eat insects, worms, and some sea life. When man tried to get mammals to eat meat parts that were mixed into their feed, they brought forth Mad Cow Disease.