Add and remove some animals, observe how sfPrototypeMan maintains the field index (first column) which is used for - most importantly - input names as well.
Drag to reorder the fields to show the interaction of sfPrototypeMan with jQuery UI sortable. It does not rely on it, but they will interact out-of-the-box if used in conjunction.
If you use your own DOM modification code it can interact with sfPrototypeMan through callbacks you provide (see Readme > Events).