Stress-related behaviors displayed by search and rescue dogs are not influenced by frequency of training sessions and trainer experience

Abstract

Although crocodiles were once considered a species of lizard, the structure of the male reproductive organ was recognized as different from that of lizards and snakes in that it is a single structure composed of rigid collagenous tissue with a tip that inflated with blood and not the paired inverted structures characteristic of the Squamata. The early descriptions of the male crocodilian reproductive system were made on immature or poorly preserved museum specimens and thus most of what these anatomists were able to see was not very useful. In a few instances, however, fresh specimens were available and more accurate descriptions were published.