I do not understand animal rights

[According to animal rights activists in Germany](http://www.smh.com.au/news/world/kill-this-cub-you-must-be-knuts/2007/03/21/1174153106086.html), it *is* a violation of a polar cubs’ rights to painstakingly care for it and raise it by hand after being rejected by its mother, but it *is not* a violation of its rights to let it die.