By expanding our collective horizons, we are able to extrapolate useful information and perhaps even apply it to our jobs or startups. For example, ant colony optimization came about by studying ants - not exactly what the OP would consider HN material. Genetic algorithms came about by studying genetics, mutations, and all things Darwin.
So instead of asking, "why is this on HN," we should ask ourselves or each other "how/what can we learn from this and apply it to our fields?"
> On-Topic: Anything that good hackers would find interesting. That includes more than hacking and startups. If you had to reduce it to a sentence, the answer might be: anything that gratifies one's intellectual curiosity.
> Off-Topic: Most stories about politics, or crime, or sports, unless they're evidence of some interesting new phenomenon. Videos of pratfalls or disasters, or cute animal pictures. If they'd cover it on TV news, it's probably off-topic.
There are very many places where such discussions are welcome.
Saying that, i see that this kind of exploration with rewards like a previous thought extinct specimens is a "hack" of nature, it was an investment, a climb to the top and a reward :) . Therefore it is hacker news.