I went for a walk this morning from Mt Kuring gai down to the GNW at Calna Ck then up to Berowra down to Waratah Bay along Cowan Ck and back up to Mt Kuring gai. ( A good circuit by the way.) Alomg the way I saw 4 goannas all on the Cowan Ck side. They all scarpered up trees as I approached. None were really large but all out and about.
K.