as
branding devices. Neither technique, however, has yet reached the field
biologist.

The success of any tagging program using static tags depends on the
resighting of tagged animals and the recovery of tags. For that reason,
we appeal to readers to be on the lookout for tagged animals and to
report sightings to one of the authors.

[Illustration: Appendix Figure A1.--Some of the basic kinds of tags used
to mark porpoises, dolphins, and small whales. A, B, and C are nylon
button tags, which are placed in the dorsal fin of animals and may be
clearly visible as the animal surfaces to breathe. D is a vinyl
spaghetti tag. (_Photo by R. Krenic, courtesy of Naval Undersea
Center._)]

[Illustration: Appendix Figure A2.--A spaghetti tag in the back of a
blue whale off San Clemente Island, Calif. (_Photo by S. Leatherwood._)]

[Illustration: Appendix Figure A3.--A spaghetti tag in the flank of a
bottlenosed dolphin off Loreto, Baja California, Mexico. This particular
tag was placed unusually low. The streamer and spaghetti tags are
usually placed high on the back, just in front of the dorsal fin, and
are clearly visible as the animal surfaces to breathe. (_Photo by W. E.
Evans._)]

[Illustration: Appendix Figure A4.--A button tag placed on the dorsal
fin of a newly captured saddleback dolphin off Catalina Island, Calif.
(_Photo by W. E. Evans._)]

[Illustration: Appendix Figure A5.--This is the way the button tag
appears on an animal swimming free in the open sea off Palos Verdes,
Calif. (_Photo by B. Noble, courtesy of Marineland of the Pacific._)]

[Illustration: Appendix Figure A6.--Freeze-branding is an apparently
painless method of applying a permanent identifying mark to the body of
a porpoise or whale. (_Photo of a bottlenosed dolphin off Sarasota,
Fla., by A. B. Irvine._)]

Radio Transmitter Tags

In recent years, radio transmitter tags have been developed for use on
marine mammals. As they continue to become more reliable, these tags are
expected to come into more and more widespread use.

Early radio tags (Fig. A7) were simple locator beacons which permitted
the animal to be tracked by sending a signal to a tracking vessel or
aircraft every time the animal surfaced and the antenna tip was exposed.
Even these basic packages provide important information on movement,
activity patterns, and respiration rates.

Subsequent developments have involved the addition of sensors to monitor
the maximum depth of e