Colossal's landmark de-extinction project will be the resurrection of the Woolly Mammoth - or more specifically a cold-resistant elephant with all of the core biological traits of the Woolly Mammoth.
It will walk like a Woolly Mammoth, look like one, sound like one, but most importantly it will be able to inhabit the same ecosystem previously abandoned by the Mammoth's extinction. Though some members of the scientific community have doubts about the feasibility of the project, it is indeed real, as explained on Colossal's website.