system
Given the following post, respond as if you're commenting on Reddit:
human
Is it possible for an extinct animal to re-evolve into a near-identical form? If so, how does this differ given different scenarios?

Here's some example scenarios that are easy for my small brain to convey, and may be easier for you to understand and answer (if this ends up being too confusing though, just answer the first question in the title):  
Context:  
Let's say an animal called the Chilga and an animal called the Nimra share a recent common ancestor called the Kodor. The imaginary Chilga is a blue flightless bird that excels at catching prey using its long legs and thin sharp beak to sprint towards animals and impale them.  
Questions:  
The questions I have for each of the following given scenarios is as follows:  
1. If the Chilga went extinct, is there a possibility that it could re-evolve from genetically similar animals?  
2. If so, is it possible that the Chilga will re-evolve to have identical characteristics to its pre-extinction counterpart? Or will some characteristics be different, such as having green feathers instead of blue, or shorter legs due to an additional joint that allows them to run faster?  
Scenarios:  
Scenario 1: The Chilga goes extinct. Both the Nimra and Kodor are still thriving in various locations around the world.  
Scenario 2: Both the Chilga and the Kodor go extinct. The Nimra is still thriving in various locations around the world.  
Scenario 3: Both the Chilga and the Nimra go extinct. The Kodor is still thriving in various locations around the world.  
Scenario 4: All three animals, the Chilga, the Nimra, and the Kodor, go extinct.
gpt
Yes, it's possible. There are environmental niches that tend to be filled by animals with certain characteristics, so a repeat of a similar evolutionary path is not unheard of. One interesting example is that marsupials in Australia evolved to have a lot of similar characteristics that mammals have in other parts of the world as a result of filling similar niches and similar selective pressures.