Hi,

I'm searching for (realistic) smaller mammals for poser like:

hedgehogs

rabbits

hares

small rodents

weasels

otters

...

also very much appreciated would be a realistic wolf and / or fox.

Are there any such things out there?

If you search for "Animals" at DAZ and limit it to Poser results you'll see a whole bunch of various animals, most of them being Poser 7 era. 

The search at Rendo doesn't have an animals category and searching for that term doesn't filter real well.  There is a Forest Bundle available which used to be sold at Content Paradise. But that's back in the Poser 6/7 era as well.

Whether or not they are realistic enough for your needs is the question. Standards have changed a lot since those days.

DAZ3D would be the place to check for more realistic animals compatible with Poser.  When Content Paradise was open, they had a variety of animals, but in my opinion, they were subpar.  Some of those are now legacy content in Poser.

Renderosity does have an animals category.

Try here https://www.renderosity.com/marketplace/departments/359578/wild?sb=newest&page=1&results_per_page=120

or here https://www.renderosity.com/marketplace/departments/359577/domestic?sb=newest&page=1&results_per_page=120

A lot of these are the ones hborre mentioned from Content Paradise but there are some from elsewhere

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Thank you...

the content paradise animals are.... really not up to standart, I'm afraid. I searched through DAZ and will again, but it's also not  a real good choice over there. Bigger animals no problem (but there Hivewire has filled the gap very well in regards of felines, horses and deer; still hoping for more choice for the dog though) but smaller beats - meh. The Noggins rat is still serving well enough, and I have a range of Lynes, but thewse are very basic.

Do you need to pose them? Fab.com (was Sketchfab) has a lot of 3D models some of which are high quality, just not as Poser characters/props. Usually can be used as fbx. Quality varies but some look good. https://www.fab.com/category/3d-model/characters-creatures--animals  Prices tend to be high though.