They have their prices listed on their website. Theres different tours you can take.
Check the Tickets tab of the website for the most accurate information. Basically, the evening tours and feeding are every Wednesday, Friday, and Saturday (with very few exceptions). Cost is $15 for anyone 12 and older, $10 for kids 3-11, and free for kids 2 and younger. Afternoon tours (no feeding) are typically every Thursday and one Sunday each month. Cost is $10 for anyone 12 and older, $5 for kids 3-11, and free to kids 2 and younger.
$10 for the early viewing and $15 for per person for the night feeding and views.
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