The following video demonstrates a procedure to insert a passive integrated transponder (PIT) tag under the skin of an anuran (frog or toad) for research and monitoring purposes.
Typically, a 12.5 mm tag (0.5 in.) is used to uniquely identify individual anurans as smal as 40 mm (1.6 in.) in length from snout to vent.
Smaller tags are also available and allow smaller anurans to be tagged.
The procedure does not differ for other sizes of tages or other sizes of anurans.
Anyone using this procedure should ensure that the tag is small enough to fit easily behind the sacral hump of the anuran, as shown in this video.
Additional publication details
USGS Numbered Series
PIT Tagging Anurans
Geological Survey (U.S.)
U.S. Geological Survey
Movie: 13:06 minutes long; available as a Flash file played online or can be downloaded in MPEG or WMV format