What is homologous animals?

Homology refers to two things that have an equivalent role or relationship. Homology is important in comparative biology since it makes it possible to determine if two different animals or plants share a common ancestor. Essentially, homology in this context means that there are two species that have related parts that do similar things, but that are not exactly the same.
Homology In the Animal Kingdom
Following are some examples of homology:
1) The arm of a human, the wing of a bird or a bat, the leg of a dog and the flipper of a dolphin or whale are homologous structures. They are different and have a different purpose, but they are similar and share common traits. They are considered homologous structures because they have a similar underlying anatomy.
2) The pelvis of a dog, of a cat and of a human and of a snake are homologous structures.
3)The tailbone of a human being and the tail of a monkey are examples of homology. The tailbone is actually called the tailbone because of this shared lineage. Because a human doesn’t actually have a tail but the tailbone is the last vestige or remains of where a tail would be, it is referred to as “vestigial.”