It's been a while since we've seen an experiment in the Groo Hybrid Program (GHP). Here we see the process of what Groo goes though in one of these hybridization tests.

First we have the generic DNA of a leopard injected into Groo. With the DNA introduced into his system, parts of his DNA shifts, sending the roo into a brief shock as his body adapts to the changes taking hold. Within a few hours or next day (it varies with each experiment) we see the end result.

The effects are only temporary and last anywhere from a few days to a week or two. In this time, Groo is given numerous tests so that the researchers can extract the resultant DNA of the hybridization. They use keep this DNA, and adapt it into a pill or similar item that Groo could take to return to this form after the effects wear off... if he so choose to take this form again.

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Art by  KieliIndustries - original submission in artist's gallery found here: https://www.furaffinity.net/view/40805917/

Other Groo hybrid creations are listed here : https://www.furaffinity.net/journal/2536595/

More info about this general idea of the GHP can be found here : http://www.furaffinity.net/journal/2569470/