Rhinohorns was removed on 2014/04/26. There was “takeover” because the first developer went missing but the takeover developer is missing as well. The block explorer is dead and there is obvious link to the windows wallet.

Technical Information
Release Date: 2014/03/15
Algorithm: Scrypt Adaptive N
Total supply: 50,000,000
Premine: 0.1%
Block Time: 2.5 minutes
Block Reward: 250
Difficulty Retarget:

Website
Announcement Thread
Forum
Block Explorer
Source