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.
A squirrel is a usually small animal that runs up trees for safety A squirrel is a small mammal commonly found in forest areas and even where there are large densities of peop â¦ le, such as the city. It is also any rodent with a large, bushy tale. It can be many different colours, such as gray, brown or red.