The People Learning Urban Science (PLUS) program creates partnerships and coordinates efforts involving a local zoo, university, and school district, seeking to instill within students a sense of the natural environment. Even though the majority of students live among concrete and metal structures, their eyes and ears can be trained to make careful observations of nature. Encouraging this collaboration between formal and informal science by partnering with community members via the PLUS program, teachers may extend the classroom learning beyond the four walls and heighten their students' scientific knowledge and skills. This article describes how a typical field trip to the local zoo is suddenly transformed into an exercise in authentic inquiry. The classroom teacher, local zoo curator, a PLUS partner university biologist, and the PLUS program coordinator have designed and together implement an experience that addresses the fourth-grade performance expectation 4-LS1-1 of the "Next Generation Science Standards" ("NGSS)" recognizing that students are expected to "construct an argument that plants and animals have internal and external structures that function to support survival, growth, behavior, and reproduction" (NGSS Lead States 2013, p. 38). The PLUS Program includes the local zoo curator who serves as one of the community partners in the design and implementation of the fourth-grade ethogram activity (Table 1). Two Common Core State Standards for fourth grade language arts are also addressed in this lesson.