Snap Freezing Filter Paper from Samples (video) NESP Northern Australia Environmental Resources Hub Share Print E-Mail Loading video... Caption Snap freezing the filter paper from samples taken from gouldian finch waterholes. Credit National Environmental Science Program - Northern Australia Environmental Resources Hub Usage Restrictions May be used with caption and credit in conjunction with this gouldian finch eDNA story. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.