Re: Anyone remember magazines like these from early 1990’s?
They sound like those "free binder with part one" sets that Marshall Cavendish and Orbis published in the late 1980s and early to mid 1990s which were advertised between Christmas and New Year. WHSmith sold them but generally stopped after the fourth part which meant that a lot of people couldn't continue collecting them.
The BBC series The Animals of Farthing Wood seem to spring to mind - I am certain that there was some collection series every week or fortnight at some point in the 1990s. Quest was a Marshall Cavendish series launched in 1989 and reissued a couple of years later which looked at science and technology, and so zoology could have featured within that.
My family had got the first edition of a sub-Encyclopedia Britannica series of The Joy of Knowledge which was hardback books with a black cover - one was supposed to get all 30 of them, put them in a glass bookcase and show off to visitors how "Ask the Family" middle class you were at home. It sounds a bit like that, but then again, it could sound like a lot of things.
Telling it almost exactly like it was so many years later - and proud of doing so!