In some animals, like humans, the jury is still out as to what function an appendix serves. Humans can live without any complications if they appendix is removed. In animals such as rabbits, the appendix serves as a storage are for lymphatic tissue.
An appendix
Yes, fetal pigs do have an appendix. The appendix is a small, finger-shaped organ located at the junction of the small and large intestines. However, the appendix in fetal pigs and humans is not as prominent as in other animals.
Yes. Most animals don't have an appendix. Apes and monkeys have an appendix like a human's (a long tube), and rabbits and a few species of other rodents have a more sack-like appendix. None of the other animals has one.
The longest appendix relative to body size is found in rabbits, as they have a very long appendix compared to other animals. The elongated appendix in rabbits helps in digesting cellulose from their plant-based diet.
No. The appendix is the vestigial (now mostly useless) caecum found in humans. Dogs do not have an 'appendix', but they do have a small caecum (a coiled organ), which does not have a very important role (unlike the caecum in herbivores).