The organelle you would expect to find in animal cells but not plant cells is the centriole.

Here's why:

* Centrioles are involved in cell division, specifically the formation of microtubules that help separate chromosomes.

* Plant cells have a different mechanism for cell division that doesn't rely on centrioles. They use a structure called the spindle pole body instead.

Let me know if you'd like to learn more about other organelle differences between animal and plant cells!