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The purpose of this study is to test if recreationist progress in their level of specialization over time, and to test the mechanism underlying progression. using a panel of American birders collected in 1997 and 2002. Results show that the birders tended to progress over the time period in terms of birding skills and knowledge, while they stayed in the same level in terms of frequency of participation and psychological commitment. Results also show that the birders level of specialization in 1997 largely explained their level of specialization in 2002. However, support from significant others, disappointment, enduring rewards, and life course changes that the birders experienced during the time period only partially explained the birders’ level specialization in 2002.