It looks like they just pushed some of the photos further forward in the text and corrected a small omission ("give it a man who was very familiar" to "give it to a man...").
There was a BBC article (about rebooting a species, inbreeding and recessive genes) mentioning Bells Pyramid last week. Perhaps that spurred the update?
You can use the wayback machine to get old versions and diff the two raw html files (little bit dirty, but it works). Only found changes in the wording of the "description" and "og:description" meta tags.
<meta name="description" content="The insect
is so large — as big as a human hand — it's been dubbed a "tree lobster." [-It was thought to be-]{+Presumed+} extinct,[-but-] some enterprising ento
mologists [-scoured-]{+found them on+} a barren hunk of rock in the middle of the [-ocean and found surviving Lord Howe Island stick insects."-]{+ocean."+} />
Edit: Is there a way to get the raw html from archive.org without the rewritten links? It pollutes the diff badly.