At dawn, kingfishers, grey-cheeked fulvettas, black-browed barbets, and brown dippers come out for breakfast, and sharp-eyed visitors may catch a glimpse of the Formosan macaque, Reeve's muntjac, or red-bellied tree squirrel. Also swimming around in the Happen River is the Taiwan shoveljaw carp. At night, glowworms dot parts of the landscape.
晨昏時，出來覓食的翠鳥、繡眼畫眉、五色鳥、河鳥穿梭其間，眼尖的人還能一睹台灣獼猴、山羌、赤腹松鼠的身影，哈盆溪裡苦花魚成群，夜間還有點點螢火蟲出沒，堪稱是台灣的「亞馬遜寶庫」。