Thoroughly updated, streamlined, and enhanced with pedagogical features, the twelfth edition of Barresi and Gilbert s Developmental Biology engages students and empowers instructors to effectively teach both the stable principles and the newest front-page research of this vast, complex, and multi-disciplinary field. This much loved, well-illustrated, and remarkably well written textbook invigorates the classical insights of embryology with cutting edge material, and makes the most complex topics understandable to a new generation of students. Designed with the undergraduate student in mind, this new, streamlined edition now contains studies of plant development, expanded coverage of regeneration, over a hundred new and revised illustrations, and deeply integrated active learning resources that build on the text s enthusiasm and accuracy. This is a text designed to make students become excited about how animals and plants develop their complex bodies from simple origins. The new edition makes it easier to customize one s developmental biology course to the needs and interests of today s students, integrating the printed book with electronic interviews, videos, and tutorials. Michael J. F. Barresi brings his creativity and expertise as a teacher and as an artist of computer-mediated learning to the book, allowing the professor to use both standard and alternative ways of teaching animal and plant development.