Biomimetica is happy to make available the first public release of its Marine Mammal Movement and Behavior (3MB) software package. The 3MB software is a component of the forthcoming Effects of Sound on the Marine Environment (ESME) software package. The 3MB software allows the creation of simulated aquatic species, or animats. Each animat consists of a series of behavioral states with probabilities of transition between states that can be modified according to time of day. Each behavioral state contains controls for dictating the various components of an animat's dive behavior, including depth, ascent and descent speed, horizontal rate of travel, surface time, etc. Animat movements may also be constrained by bathymetric features and animats can be made responsive to simulated sound exposures. Furthermore, animats may function as individuals or be constrained to "pod" behavior. The 3MB software permits the exploration of species dive behavior and provides a cursory approach to estimating acoustic impacts to marine mammals. Simple sound sources are made available in 3MB and a suite of "aversive" behaviors that are triggered above a threshold response can be programmed by the user. This permits the exploration of possible response scenarios to sound exposure, including the potential for beaching. The 3MB software also provides a "take" estimate of marine mammals, as defined under the Marine Mammal Protection Act. The criteria and metrics for estimating "take" are based on approaches implemented by the National Marine Fisheries Service and the United States Navy for mid-frequency active sound sources. However, the criteria and thresholds implemented in 3MB should not be considered to have the endorsement of either agency and threshold values may vary in upcoming releases of the software. The 3MB software package may be obtained from http://members.cox.net/biomimetica/download%20page.htm. The package contains the following: Marine Mammal Movement and Behavior (3MB) executable Species Builder executable Bathymetry files (Bahamas, Mid-Atlantic Bight, Southern California Bight) Sound Source files (one mobile and one stationary sound source) Species files (a "generic" mysticete and odontocete) User Manual Quick Start Guide (MatLab scripts for processing 3MB output files are also available at the site.) The 3MB software is free to the public. Its development was made possible by support from the Office of Naval Research. If you find bugs or errors in the software, I encourage you to report them to matthewjancross@gmail.com. Recommendations for feature enhancement should be sent to biomimetica@cox.net. We will attempt to address bug-fixes and enhancements in future releases of 3MB. Sincerely, Dorian S. Houser Dorian S. Houser, Ph.D. Owner/Research Scientist BIOMIMETICA biomimetica@cox.net