ach dive and environmental parameters such as the
water temperature at that depth (Fig. A8).

Logical extensions of these developments include the addition of
numerous other sensors to permit simultaneous monitoring of multiple
aspects of the animal's environment and the transmission of these data
first to aircraft and subsequently to satellites for relay to
shore-based laboratories.

In addition to permitting scientists to define movement patterns and
daily diving patterns of cetaceans, the use of such devices offers an
exciting means of determining the environmental parameters that trigger
changes in their behavior.

Radio transmitter tags, in a variety of configurations, may be
constructed and attached for short-term studies or for long-term
monitoring of migrating animals. In either case, depending on their size
and methods of attachment, radio transmitter tags may be visible on a
free-swimming animal even at a considerable distance.

[Illustration: Appendix Figure A7.--A saddleback dolphin wearing a radio
tag transmitter surfaces to breathe off southern California. (_Photo
courtesy of W. E. Evans._)]

[Illustration: Appendix Figure A8.--A radio transmitter package attached
to the dorsal ridge of a California gray whale. This yearling animal,
captive for most of the first year of its life, was released into the
ocean off San Diego, Calif., in March 1972 and subsequently tracked from
shipboard and aircraft for over 30 days. The sensor transmitter package,
shown in detail in the inset, was designed to measure the maximum depth
of the animal's dive and the water temperature at that depth. (_Photo by
S. Leatherwood._)]

Natural Markings

In addition to these man-made and applied tags, variations in natural
markings and unusual appearances may be used to identify individuals and
herds on repeated encounters. Although many species of cetaceans are
characterized by changes in color pattern with age, individuals
occasionally differ radically in their coloration from their fellows
(App. Figs. A9, A10). In addition, individuals are sometimes seen with
unusually shaped dorsal fins or scarring patterns (App. Fig. A11). These
unusually marked animals should stand out in repeated encounters and can
be a help in identifying a herd from one encounter to another.

Obviously, this list of tags and anomalous markings is not exhaustive.
New marks may be developed at any time. The discussion is intended to
make the reader aw