Reaper Cuttlefish
There are three species of cuttlefish in Sydney; two little ones and one giant (cleverly named the giant cuttlefish). It's easy to identify the big one, but the other two are not always so easy to distinguish.
You see, cuttlefish can change their shape and colour, so Reaper Cuttlefish can make themselves look like the similar sized Mourning Cuttlefish and vice versa. It all depends on whether they're in a reaping or a mourning mood. If it's a blood red colour though, it normally means it's a reaper (in a particularly grim mood).