John Alcock's Animal Behavior is one of the most respected (and highly cited) textbooks on the subject which is in its 10th edition, thus standing the test of time. An 11th edition of the book will be released in June 2018, and will now include Dustin Rubenstein as a co-author. You can't go wrong with either.
Between the texts I have read I can recommend CURIOUS NATURALISTS, of Niko Tinbergen. Even if it is an old book (the first edition was published in 1958), includes some very interesting and classic examples of animal behaviour. See this link about the book in question:
Comparative animal behaviour: an evolutionary and ecological approach. Richard Maier.
In spanish (I don´know if there is an english version) : Etología, Introducción a la ciencia del comportamiento, Fernando Álvarez, et al. In Researchgate you have the link to the full text.
And, related to primates: Primate Behavioral Ecology, Karen B. Strier.
I also use Alcock's "Animal Behavior" textbook, now in its 10th edition. It requires "critical reading" skills, which is a plus. The instructor resources include videos, presentations, quizzes and instructor answers, and other helpful information.
I used the electronic version of Lee Dugatkin's book "principles of animal behavior". It is full of interesting examples, videos and self-tests. I highly recommend it.
While I agree that Alcock's is an excellent textbook (possibly the best), it may be too much for a one semester introductory course. You may also want to consider more accessible textbooks such as Manning & Stamp Dawkins' An Introduction to Animal Behaviour (Cambridge UP).