From Wikipedia:

Mammals having a penile bone (in males) and a clitoral bone (in females) include various eutherians:

• Order Primates, although not in humans.
• Order Rodentia (rodents), though not in the related order Lagomorpha (rabbits, hares etc.).
• Order Insectivora (insectivores, including moles, shrews, and hedgehogs).
• Order Carnivora (including members of many well-known Families, such as Ursids (bears),[3] Felids (cats), Canids (dogs), Pinnipeds (Walruses, Seals, Sea Lions), Procyonids (Raccoons etc.), Mustelids (Otters, weasels, skunks and others)).
• Order Chiroptera (bats).

It is absent in humans, equids, elephants, monotremes, marsupials, lagomorphs, hyenas, and cetaceans (whales, dolphins, and porpoises), among others.

Such a wide distribution among placental mammals suggests that the bone evolved early in the history of these mammals, and was subsequently lost in certain groups.

Among the primates the marmoset, weighing around 500g, has a baculum measuring around 2mm, while the tiny 63g Galago has one around 13mm long. The Great Apes, despite their size, tend to have very small penis bones, and humans are the only ones to have lost them altogether.

Are fossas the only animals with a clitoris bone?

They are not, though it's a lot rarer than a penis bone. I believe it's been found in some squirrels, for instance.

Some of the animal folk who have lost it are sufficiently well-endowed, one would think they could use it. Why evolve it, only to discard it?

Also, is the plural of baculum "bacula"? I need to start a collection. "These are my bacula: cat, walrus, and scott."

This is making the song "The ankle bone's connected to the shin bone" sound a lot more interesting.

"These are my bacula: cat, walrus, and scott."

And of course, the extinct island version, Great Scott.

Kind of off-topic, but I found it amusing:

Our love is like Metro delays - neverending

I went to the dentist this morning because the painful tooth was still exceptionally painful. Turns out that it's *not* the tooth that had the broken filling repaired; it's the tooth behind it. The painful tooth had some deep fillings done in the past, and that can lead to damaged pulp and eventual root canal.

But the dentist told me to finish up the antibiotics she prescribed for the sinus infection, to see if that helps, because Monday's x-ray didn't show an abscess or anything weird with the painful tooth. (Though there doesn't necessarily need to be an abscess to indicate the need for a root canal.)

Anyway, I take the last antibiotic Friday morning; she said if there doesn't seem to be any improvement by noon-ish Friday, to call them and they'll get me in to figure it out.

So now I'm just chanting "Go, antibiotics, go!" in the back of my head. And chewing verrrrrry carefully.

yikes, Tep. But sounds better than more dental work.

Females in heat hang out in a tree and pick their mates from the gathered horde of wooing admirers. "Next! You, with the orange belly, up here!"

The female they were watching last night mated with like, 13 dudes in the timespan of a few hours! I was cracking up and then was scolded for slut-shaming the fossa.

The aye-ayes were awesome, too. And the giraffe necked beetle was flipping sweet. All that work for one freaking egg. (They lay one egg in a particular kind of leaf and then roll the leaf up all neat-like and then drop it onto the jungle floor. ONE EGG.

They lay one egg in a particular kind of leaf and then roll the leaf up all neat-like and then drop it onto the jungle floor. ONE EGG.

I take it their life-spans are a little longer than most insects? That or they spend a heck of a lot of time rolling leaves.