When taking a looking look at a whale and a hummingbird, it may have never crossed your mind that these two share homologous traits. A whale is a very large sea creature that weighs a ton of pounds and its home resides in the ocean. We are able to see whales come up to surface as they are sea animals that breathe air.  Whales are mammals and give live birth. This is unlike hummingbirds. A bird that flies in the sky weighing in about 0.14oz and is the smallest amongst bird species. Hummingbirds are vibrant with brightly colored wings.They have originated from South Africa and are found in many areas of the world. 

Whales and hummingbirds have many differences from size, appearance, to habitats. However these two animals share skeletal bony structures. The skeleton of whales and hummingbirds have similar skulls, humerus, ulna, radius,legs, ribs and phalanges. Over many million of years, whales and hummingbirds have had changes to the skeleton bodys in order to keep up with natural selection 

In order for whales and hummingbirds to share homologous traits there was a common ancestor the two shared. This ancestor had limbs with one long bone and connected to two other bones. The structures were inherited by different species and those animals made some changes to continue with evolution. 

It's known that birds also share similarities with butterflies and that's through their wings. The first bird to be known was discovered in the 1860. Birds are known to have branched off from dinosaurs. However like many species evolution causes modifications in order to continue to survive. When it comes to butterflies, scientists believe they were around with dinosaurs and developed with the flower and plants. Although, butterflies have been around for millions of years their life span is a 5 weeks . 

Birds and butterflies both share the similarity of having wings. Birds' wings are made up of bones and covered in feathers. However, butterfly wings are not made up of bone and they are covered in scales. These allow each species to be able to fly and adapt to its life in the air. 

The common ancestor between the two would be dinosaurs. It is possible the common ancestor shares this analogous trait but over years each species has modified their wings. There is no structural connection between the two.