“…Most visitor-based researchers have investigated the effects of crowd size [11,14,[16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32], length of time at the enclosure [23,29,30,33], zoo attendance [12,17,28,[34][35][36][37][38][39], visitor attendance days [8,9,40,41], observer effects [42], and visitor attendance times [16] on animal behavior. Additionally, visitor behavior [6,20,23,29,31,33,[43][44][45], including noise levels [6,11,18,…”