Unidentified nocturnal bird in creek after dark

It was well after all the birds had gone to sleep but before it was completely dark outside when I was walking home from the service station and walking across the Douglas Street bridge. I looked down at the creek but couldn't make out any details of anything on the ground near the creek. I sort of saw the creek's water which was pitch black in colour. Moments later in the area I was looking at a bird startled and it took off like a rocket under the bridge. It made no sound except for the noise it's wings made on the water as it flapped. It was approximately the size of a duck going on an approximate wing span comparison of ducks being startled on the water in that area.

When this bird took off it did not fly at all and it was about 5 feet into the water from the water's edge. It was retreating like it was pretending it couldn't fly but could still flap it's wings and ran through the water whilst flapping them. It flapped it's wings frantically to move itself across the water to safety. It may have actually ran across the water's surface whilst flapping it's wings. The bird was by itself as far as I could tell. I have, only on rare ocassions in the past, seen this bird night time behaviour before. Only now am I trying to identify the species.

When an Australian Wood Duck is startled during the day they tend to fly away. They can either fly a short or long distance away when startled and have been known to fly at night when disturbed. I do know that sometimes ducks can be heard during the night time but never so early as to just after going to sleep for the night. As this bird was alone I doubt it was a Wood Duck.

I very much doubt it was the White-faced Heron female either as I have yet to hear her during the night time. She is always up early in the morning. As far as I know White-faced Herons are not nocturnal.

Ruling out Australian Wood Ducks and the White-faced Heron leaves only Masked Lapwings and Pacific Black Ducks. It was not a Masked Lapwing as they were all up on Francis Street at the time. This time of the year all the Masked Lapwings flock together as they are not breeding right now.

The Pacific Black Duck is not, as far as I know, nocturnal but I am not ruling it out as a suspect. The Pacific Black Duck rarely makes a sound during the day but I have yet to study this species. It is possible that this bird I saw tonight - well heard flapping across the water - could be a Pacific Black Duck, and what I saw it do is normal startled night time behaviour for this species.

I very much doubt it was an owl or a Tawny Frogmouth as I've never heard of any of them actually feeding in the water. I can also rule out raptors too for this exact same reason plus I don't know of any raptors that are nocturnal.

There are no other known species that spends a lot of time in the water here in Tenterfield that are on my list of what this bird could be. This brings me back to it possibly being a Pacific Black Duck, and possibly nesting somewhere nearby in the water maybe even under the bridge itself. The "possibly" bit is looking more like a "more than likely it was a Pacific Black Duck" than anything else right now. Tomorrow I'll go to the bridge to see if there are any Pacific Black Ducks in the immediate area.

Pacific Black Duck Anas superciliosa

All ducks look the same to me which is why I never noticed the Pacific Black Ducks before. That was until I discovered in a few past photos that some so-called Australian Wood Ducks had long white eye markings like this one below. Click to enlarge the photo.

Pacific Black Ducks taken about Aug. 2012

It seems, now that I think about it, these ducks are always seen in pairs even if they are in a small group. I have not seen them on land at all, except for years ago when they were hanging around the Agricultural paddocks that belong to the High School. They always seem to be in the creek/water unless they get spooked and fly further along the creek out of harms way.

Late last month I took some decent duck photos which turned out to be of Pacific Black Ducks, well a pair of them anyway. (Now I can't find these said photos on my computer.) They did not mind me getting close to them to take their photographs. They were swimming in the creek which was recently flooded, and were playing with the water current.

Currently they are in pairs, not in groups, so it must be getting close to their breeding season.

The Pacific Black Ducks are one of my favourite bird species, and even though they look similar to any duck out there, they can be easily identified by their metallic turquoise-green wing patches and their long white eye markings. And you mostly see them in pairs in the Tenterfield Creek, and elsewhere - probably even at the Tenterfield Dam.

These ducks seem to prefer water with a current flowing through it rather than still water.

What these ducks eat would be whatever exists in the water. Although they are supposed to be herbivores eating seeds of aquatic plants they do also eat small insects and other things found in or on the water. Very rarely do they search for food on land.

At a guess I'd say there are about 20 individuals of this species within the township of Tenterfield that exist/inhabit the Tenterfield Creek only. They are not as numerous as the Australian Wood Ducks, that's for sure.