Freshwater Crocodiles in Ross River

We know they are there, but we don’t often see them – freshwater crocodiles in Ross River, that is.

Freshies, as many locals call them, are smaller than salties. They are generally shy, attacking only when startled into defending themselves; and when they do, their narrow jaws and relatively small teeth can’t do as much damage as a saltie’s heavy head, although the Australian Museum warns us that they can still cause serious injuries.

They can also be hard to spot, even in plain view.

crocodile on log
Catching some sunshine

This one was barely a metre from the river bank, and less than ten from the bike path upstream from Aplin’s Weir on the Douglas side of the river.

I only interrupted my ride because I saw a water bird drying its wings on the tip of the dead tree, and only noticed the crocodile after taking photos of the bird.

crocodile on log
A closer view

I walked down the bank to within a couple of metres of the croc but it didn’t even stir, and I had to resist the temptation to toss a stick at it to make sure it was still alive: crocodiles deserve their nap times just as much as we do. I reckoned it to be 1.5 – 1.8 metres long, which in freshie terms is well grown but not outstandingly large.

The bird wasn’t bothered by my movements, either. It was still on its perch after I had finished photographing the crocodile beneath it:

Little Pied Cormorant
Little Pied Cormorant

Spice finches in Bali

One of my readers used the workaround ‘comment’ routine recently to ask me about some birds she sees on her side of Ross River:

I live on the river in Annandale and since moving here 18 months ago have developed a great love of birds – they are in my garden and on the river.  I manage to identify most of them but there is one little fellow I just can’t – I have googled, looked in the books and sites.
It is not a very pretty little bloke but I love them. They are, I would imagine, a finch, [with] the round little fat body, always in a flock of around 10 -15, fly very fast, love the seed in my lawn, love my bird bath as it’s very protected. He is a medium flat brown with a black mask across his eyes, has a short tail, easily frightened.
This little bird is too small for me to get a photo with my camera. Malcolm do you have any idea what it is, I would be grateful for your comments.

I was happy to help, especially as Lynne had provided such a good description that there was only one real candidate, the Spice Finches (Lonchura punctulata). As I told her, they are Asian birds, relatively recent arrivals in our region but now well established in our parklands, so older bird books might not describe them, or might not show them as living here.

I have already written about them here and, more recently, here but Lynne’s enquiry reminded me that I had intended to write about them again after my return from Bali in April (this link will lead you to earlier posts about the island). They are a native species there, so seeing them was no surprise. Seeing them feeding on a tidal rock platform, however, was quite unexpected.  Continue reading “Spice finches in Bali”

Shore birds at the mouth of Ross River

ross river mouth
Wet-season sky over the mouth of Ross River

Business in South Townsville ten days ago was enough excuse for a brief visit to the mouth of Ross River. I parked near the end of Boundary Street and walked along the beach to towards the new bridge for this dramatic cloudscape. (We’ve seen lots of promising clouds lately, but still very little rain.) Construction of that bridge and its associated Port Access Road, by the way, is what was blamed for driving the flying foxes and ibis away from the mangroves in the distance to the Palmetum and Dan Gleason Gardens.

There are always shore birds to be seen here. Terns were fishing in the river (Common Terns, I think, Continue reading “Shore birds at the mouth of Ross River”

Monarch butterfly and Leichhardt tree

Monarch butterfly
Monarch on Leichhardt tree flower – photo: Liz Downes

A friend sent me this photo and the subject has enough points of interest that I asked her permission to publish it here. The (really obvious) questions are mine, of course – the Q&A format is just for fun.

What is that spiky ball? It’s a flower – more accurately, a flower cluster – of the Leichhardt Tree, Nauclea orientalis.

So the butterfly is sipping nectar from it? Yes. Butterflies are not fussy eaters. They think nectar is nectar, and so long as they can reach it with their proboscises they will take advantage of it.

I’ve seen the butterfly before but not that weird flower. I guess the tree is an exotic? Wrong way round, actually: the tree is a native but the butterfly is a foreigner. It is well naturalised by now but is an American species, the Monarch or Wanderer, Danaus plexippus. Back home, they are famous for their mass migrations. Here, they have spread from Sydney (1871) to Southern West Australia and (obviously) North Queensland.

Is there any connection between the butterfly and the flower, then? Yes, but it’s indirect. The Monarch is a Milkweed butterfly (Danainae, a sub-family of Nymphalidae) and their caterpillars do require particular plants.

Let me guess: milkweeds? Yes – well done! And the botanical family is noted for milky white sap, often poisonous. The caterpillars tolerate and absorb toxins from the food plant, making them distasteful to predators. Local plants in the family include oleanders, frangipani and lots of the smaller weedy plants which grow along river banks.

And the tree? It’s not a milkweed, but it likes wet feet so it grows along river banks too. This one was beside Ross River near the Bush Garden.

And that completes the reasoning: the adult butterfly was near the river to lay eggs on the milkweeds; the tree was near the river for the water; and its flower was a convenient snack for the butterfly.