It's still doable, but it will require quite a bit of breeding. Unfortunately, going by the numbers it doesn't look like too many players are participating with any significant success at all. I guess reacting to the complaint that the old challenges were too specific by making this challenge even more specific and adding another qualifier on top didn't help, especially considering that these elephants aren't exactly quick or cheap to breed without a dedicated breeding zoo. It's quite likely that many players who would have otherwise contributed at least casually didn't bother at all under these circumstances.
Anyway, I'll see if my small breeding program can squeeze out a couple more little trunksters who get us a little closer to victory.