It's the Reptile Zoo which incorporates Beaver World Marco, a name which has led to some disappointment in folk I've taken there. Last time I was there with Ben he asked about the crocodile they used to have as he fancied a wrestle but it had long since died and they aren't allowed to have another one as they aren't big and posh enough and don't have the certification needed for one these days, despite having had one for many years and cared for it well.
By the way they don't want you to leave you bikes along the fence outside the cafe anymore as it's actually a flowerbed. If you go down the little hill to the right of the cafe then they are happy for you to tuck them behind the building immediately on your right where they are out of everyone's way. It also gives you the chance to see the lovely ring-tailed limas on the other side of the hill opposite where you put your bikes.
Have fun.