That was a tricky question. As animals are defined by the lack of chloroplasts, there is nothing specific that exists in all animal cells that is not also found in plant cells. One thing that is specific for animal cells is a mitochondrion with a very small genome. read more
The two cellular structures found in animal cells but not in plant cells are the centrosome and the lysosome. The centrosome is the microtubule-organizing center of the cell, giving rise to the mitotic spindle. read more