Salamanders are subject to misconceptions even among vertebrate
zoologists and physiologists. They are often said to exist only in
northern temperate zones, being bound to aquatic or very moist cool
habitats. In reality, more than half of all salamander species live in
subtropical and tropical zones, ex- clusively in the New World. Again,
more than half of the salamand r species have become totally independent
of aquatic habitats following the loss of a free larval stage. Many of
the subtropical and tropical salamanders have become adapted to rather
high temperatures up to 26-28 DC. The brain and the sensory systems of
salamanders are often considered to be primitive, and their behavior is
thought to be simple and uninfluenced by learning. However, careful
studies show that the salamander brain possesses virtually all the ana-
tomical and functional properties found in anurans, which are usually
regarded as being much more evolved with respect to the guidance of
comparable behavior. Most of the salamander species not only possess a
highly efficient visual system, which is the topic of the present work,
but can orient themselves almost as effectively by means of olfaction,
vibration sense, and electroreception. Furthermore, it has recently been
shown that at least part of their behavior, especially that concerned
with feeding and prey preferences, is strongly influenced by individual
experience.