So I literally know nothing about cresties and I'm curious as to why I see so many cresties without a tail? Is their tail falling off just something that happens with the species?
It is very common for crested geckos to lose their tails as adults, compared to other geckos. Also, most other geckos grow their tails back, albeit looking slightly different, while cresties don’t, so it’s far more noticeable of course.
I have one frogbutt (crested gecko without a tail) and two with tails.
In the wild, crested geckos do not keep their tails to adulthood! Researchers hardly ever find an adult gecko with a tail.
In fact, one of the reasons “floppy tail”/”lazy tail” seems so common is that the muscles used to hold their tails are not really strong enough to support their tails into adulthood (in addition to perching upside-down on glass which is not natural).
This is one reason it’s so important to provide a lot of cover and platforms and perches for crested geckos, beyond that it makes them more comfortable. Even doing this, however, lazy tail does happen... especially with some geckos who just really really like sleeping with their tails arched over their backs. Haha. (Floppy tail as a sign of MBD is a whole different matter!! It also involves tail kinks or waves and is a result of a bad diet.) Niji has very mild floppy tail (you can see in some of his pictures he holds it a bit like a hook) which seems to have gotten somewhat better with some gentle tail exercises.
We like our geckos to keep their tails (because tail loss is a source of stress, an open wound, as well as aesthetics), so we do everything we can to prevent their loss. We treat them very gently, don’t hold them by their tails, try not to startle them, and don’t cohabitate them.
However, crested gecko tail loss does happen. It’s important when they do to keep their habitats (and them) extra clean, feed them lots of nutritious food to help them heal, and keep an eye on the open wound. Most heal into adorable frogbutts with no problem.