One of the reasons I don't begrudge paying the TV license fee is BBC wildlife documentaries. (Do foreigners know that if you have a TV in Britain you have to pay a tax of £150 or so which goes to fund shite like Dr Who? Well...you do.) Blimey but we, as a nation, make bloody good wildlife documentaries. I have serious reservations about the way things have gone in recent years - there is way too much slo-mo and musical grandstanding in the recent big budget hits like Planet Earth II and Africa - but we are still streets ahead of the competition, and the excellent Springwatch is a great counterbalance to the OTT Attenborough flagships.
Ever since I was doing my old Monstrous Manual thread on rpg.net (see links to the right of this page), I have always had it in mind to do a game about the "sages" who appear in almost every entry speculating about monster origins, habits and behaviour. A campaign in which the PCs are a band of scholars heading out into the wilderness or underworld in search not of treasure but of knowledge about its denizens. Making records ("Ah, so the death mold uses sverfneblin tears as an aphrodisiac!") and getting XP for it.
You could do something similar about wildlife photographers - on MARS! or other alien environment of your choice. (Another variation would be idle aristocrats exploring the Lovecraftian Dreamlands or similar, taking Daguerrotype photographs with incredibly long exposure times and trying to stay alive long enough to get good shots.) PCs going out with the aim of documenting rather than looting - at most collecting samples.
The problem I invariably stumble against is how to measure success in such a game. So let's muse aloud. Getting XP for documenting facts about monsters can be calculable on a rarity basis (50 XP for uncommon, 250 XP for rare, and so on) but from there things would get complicated. You could divide or multiply the number of XP based on the clarity or accuracy of the information. You could also do it with the significance of the facts learned (appearance alone being a low XP reward; information about abilities being higher, and so on). And you could increase the ratio for the obscurity of the fact - it is harder to learn some abilities than others. If photographs were being used, the XP reward could be clarified by quality of the shot.
The problem is that you would end up spending a lot of time, I think, caught up in calculating XP, and consulting lists of XP for different monsters and/or categories of fact (how much XP is it worth to learn about a vampire's restriction on entering a home uninvited?, etc.). This would be a lot of work for DM and players alike. Are there any alternatives? Answers on a postcode or - at a push - a comment.