3DS Max.

From The Amber Spyglass by Philip Pullman.
A slightly tweaked version of an old model. I'm still not entirely happy, but it's better than it was.

Sky from ~CHOAMstock




UPDATE:

I think I need to include a little extra information about this image because it has turned out to be one of my most popular, even though it's technically not a very good model even by my standards. I do, however, have to defend its basic accuracy against some criticisms it has received.

It's only natural that people are going to have their own image of these creatures in their heads, and the model lacks a lot of realistic anatomical detail (it's not even rigged), but I did base the model on the exact description in the book.

If you read it carefully, the measurements for the seed pods, and the trunk, are given in relation to a human hand and arm. It was fairly simple to use those measurements in Max and then extrapolate for the rest of the body.
The legs, for example, had to be long enough to hold the seed pod away from the body, but making them any longer than necessary risked making the creature's centre of gravity too high.

I've never been happy with the feet, but they had to be very simple and unable to grip: These creatures do every task with their trunks, even though it means working as a pair to tie knots. I positioned the claws on alternating sides because it seemed like the way natural symmetry would work on a diamond framed creature, and it could help with balance.

And, finally, they absolutely do have horns - some even wear gold rings on them (read the book).


Oh, and one more thing. When I originally made the model, some years ago, I sent a print to Philip Pullman. He wrote back confirming that I had got it right, except I had the legs bending the wrong way (with knees like an elephant).
I had to guess about the leg bend, and had tried to imagine how Philip Pullman had come up with the design. I started to think about him walking around Oxford, watching cyclists passing by ... the bike and rider merging into one creature … the cyclists legs becoming the creatures lateral legs. I was wrong.

This is the corrected version of the model, with better rendering and some hair.