Since nobody else will answer your question, I shall bestow upon you more knowledge from my youth. I used to have a full set of these things, and while I'm not sure if they still make new ones, you can still find 'em. I've even seen sets in thrift shops before. They were called Wildlife Treasury.
Here's a set on eBay in case you're interested.
And yes, it is because of the commercials for those sets that I became fascinated with the duck-billed platypus among other creatures. :o