In 1971 Colin Groves recognized the pygmy slow loris (N. pygmaeus) as a separate species, and divided N. coucang into four subspecies.

In 2008, Russell Mittermeier, Colin Groves, and others ignored addressing higher-level taxonomy by defining lemurs as monophyletic and containing five living families, including Daubentoniidae.

When splitting the species into its own genus, Colin Groves and Myron Shekelle recognized the natunensis population as a distinct subspecies.

The species was separated from the brown greater galago by Colin Groves in 2001.

In 2007, Colin Groves elevated them all to species level, splitting one (johnstoni) into two species.

After a revision of the ungulates in 2011 by Colin Groves, it is now regarded as distinct species.

He co-edited the book Skeptical - A handbook of pseudoscience and the paranormal in 1989 with Donald Laycock, Colin Groves and Simon Brown.

As a genus, Ammelaphus had fallen out of favor, but was recently raised to a genus level by Peter Grubb and Colin Groves in 2011.

Colin Groves upgraded the Ugandan population into the new species L. ugandae on February 16, 2007.

In 1975, Colin Groves and Vratislav Mazák announced a new species of human they called Homo ergaster.