A wallaby swimming across Sydney Harbour surprised passengers taking an evening ferry today (February 1).

In the video, a wallaby can be seen bobbing up and down in the waters among ferries.

Writes the filmer: "I was taking the 19:00 fast ferry from Manly to Sydney city and just as we pulled out of the wharf the ferry stopped. I’d just bought a beer and the ferry worker who served me laughed and said, “If you look over there, there’s a wallaby in the harbour.

"I walked out on the deck and started to film what was going on. One of the other ferries was trying to guide the wallaby back to shore and was watching out for the little fella.

"Our ferry wouldn’t leave until they thought it was all under control and that the wallaby would be ok. Fair play to the ferry lads for looking out for him."