It has almost become a January tradition (since Fantastic species and where to find them in 2017) that I start the year writing a light-hearted feature on the wonders of the natural world. So this years it's all about sponges:
Magical mysteries of marine sponges
Current Biology Volume 31, Issue 2, 25 January 2021, Pages R51-R54
Restricted access to full text and PDF download
(will become open access again one year after publication)
Magic link for free access
(first seven weeks only)
PS Last year's "fantastic" feature was about evolutionary lineages losing or gaining legs when they change their way of locomotion:
It is now in the open archives.
Where you'll also find the first feature of last year, about life after the anthropocene.