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.
Grey Tree Squirrels. Grey squirrels feed on berries, acorns, flowers and tree buds in the spring. They consume beech mast, nuts, roots, sap tissue and even small insects occasionally. They rarely will eat small bird eggs and baby chicks.Grey squirrels, like red squirrels, will bury their surplus food in the ground to retrieve it later in the winter when food is scarce. Unlike red squirrels, grey squirrels are adept at remembering where they buried food.rey Tree Squirrels. Grey squirrels feed on berries, acorns, flowers and tree buds in the spring. They consume beech mast, nuts, roots, sap tissue and even small insects occasionally. They rarely will eat small bird eggs and baby chicks.