animal-sniffer files were retrieved from:

http://repo1.maven.org/maven2/org/codehaus/mojo/signature/
http://repo1.maven.org/maven2/org/codehaus/mojo/animal-sniffer-ant-tasks/
http://repo1.maven.org/maven2/org/codehaus/mojo/animal-sniffer/

documentation is at:

http://mojo.codehaus.org/animal-sniffer/