2004). B-lymphocytes, the cells that produce antibodies, are initially produced in the embryonic liver, yolk sac and bone marrow, then move through the blood to the bursa of Fabricius (BF). Birds have a bursa of Fabricius (BF), which is an outpocketing of cloaca.
Most squirrels are vegetarians. There are a few exceptions like the flying squirrel. The flying squirrel will eat small birds, insects and definitely steal eggs from birds nest in order to make a meal. Generally speaking though, squirrels will mainly stick to things that are vegetarian related.
Do squirrels eat flowers? Quick Answer. Yes, squirrels eat flowers. Although most species of squirrel prefer seeds such as acorns, walnuts, sunflower seeds and pine cone seeds, they have been known to eat fruits, vegetables and flowering plants when these seeds are unavailable or scarce.