Species reintroduction is when humans bring an animal back to a place where it used to live, but doesn't anymore. This usually happens because the animal was gone for a long time, and can't get back by themselves.
To reintroduce a species, humans have to take a lot of steps to make sure it will be happy and safe in its new home. First, scientists study the animal very carefully to figure out exactly what it needs to live and thrive. This includes things like the food it eats, the places it needs to go, and what other animals it needs to be around.
Once scientists know what the animal needs, they work with other experts to make sure it can live in its new home. This might mean building fences to keep it safe from predators, planting certain kinds of plants that the animal likes to eat, or even bringing in other animals that the new animal needs to survive.
When the new animal is finally released into its new home, humans keep a close eye on it to make sure it's doing well. They might follow it around to see where it goes, check its poop to make sure it's eating enough, or even put tracking devices on it so they can always know where it is.
So, in summary, species reintroduction is when humans help an animal that's gone missing come back to its old home. They do a lot of work to make sure the animal will be happy and safe, and keep an eye on it to make sure it's doing well.