I spent so much time in this exhibit as a kid! I have distinct memories of the yellow herrerosaurs, the frequently origins of life puppet show, and the ramp behind the apatosaurus. Also a horse evolution puppet show I think? What a blast from the past. Thanks for sharing!

Thanks for the shoutout! Doing this on live primates is tough. We've been discussing whether we can do more but for now we're focusing on cadavers, with some surprising results so far.

Very cool! I'm confused as to why we see spikes in use of cold climates during periods of global warming (PETM & Mid Miocene) when they were presumably rarer. Does this indicate an inverse relationship between use and availability of cold climates or am I misinterpreting what climate categories are?

We do know it struggles on Windows computers without administrator privileges, but other than that while it's bare bones it's working as intended as far as we know. So curious to send it out into the world and see what people think!

I can't really say it's under 'active development', but if you find bugs or have feature suggestions, let me know and we'll add them to our list!

But operationalizing this for species is a headache, to put it mildly. And it is borderline impossible to think about species in the fossil record as anything other than fuzzy sets of morphological variation (i.e., to give them morphological definitions).

This approach is easier to take with higher taxa when we can mostly assume there is no gene flow between groups. In this case we can simply 'define' a it as 'the last common ancestor of X and Y and all of its descendants' or 'all species more closely related to A than to B'.

If taxa are 'defined' by morphology, etc., then individuals can cease to be a member of that taxon, which is nonsense from a phylogenetic perspective. Snakes are still tetrapods, even if they no longer have four limbs, because four limbs is a tool to diagnose tetrapods, not the way we define them.

It's worth mentioning the distinction between definition and diagnosis of biological taxa: Taxa must be *defined* by their ancestry, but can be diagnosed (i.e., recognized) with specific characteristics and morphology. See Rowe (1987) for a concise review: www.jstor.org/stable/24132...