For some animals, the sorting in the animals tab does not seem to fully work. Most animals are grouped together with their species, but for some animals this does not work.
Panthers and alpacas: https://steamuserimages-a.akamaihd.net/ugc/1831277362742720530/65B65DBE95754B2E2A60B07EDFFBBBF8265BC65B/
I first noticed this when a bunch of new animals were introduced (1.0 or before that) and thought they might just share a sort index with older ones, but panthers and alpacas have been in the game for a long time. Dryads unfortunately mix too, so you have combat dryads and wood makers etc. alternating in that tab instead of having them grouped, which makes the whole menu less clearly laid out.
Both DLCs, no mods used.
Thanks for the bug report, I've got this reproduced in 1.3.3242. I'll work on documenting all these sorting issues for the devs.