Not workin' my mobile menu button

https://www.twinbeaksaviary.com/index-new.html

My dropdown is not dropping, and my hamburger button isn't on the menu. I'm guessing they're related, but I don't know why. (Surprise, Surprise!)

I copied the navbar from my other site, where it is working as should. But here, the dropdown doesn't function, though, and I have a hamburger button that's only for show. tia (miss me? 😉

ps. I haven't optimized, yet. This page might set off the Richter Scale!