Yet more multiple DOI madness (see Duplicate DOIs keep being minted for more examples).
The journal Science, arguably one of the world’s leading scientific journals, has multiple DOIs for the same article in its back catalogue. For example, here are three DOIs for the same article (“Some New Generic Names of Mammals”): All resolve two a URL on the https://www.science.org site, but only one to an actual article (the others return a 404):
The journal displays only one DOI on the page for this article, but the metadata is in CrossRef, so anyone doing searches for this article gets multiple hits, only one of which is correct.
It looks like Science kept changing their minds about what their DOIs should look like when there is more than one article starting on the same page, but didn’t clean up after themselves.
Perhaps Science can be invited to clean this up?