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Crocodile: Nile

Find, identify & discuss the marine species of SANParks
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LadyRaven
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Unread post by LadyRaven » Fri Mar 14, 2008 8:41 pm

Ah, I see.. Thanks.
That's what I thought...

Is it possible for Kruger crocs to become somewhat deformed? I really must locate the other picture I took, it must have been a couple years back now, but he had the most unusual risen section on the top of his head. Is this normal? Looked like nothing I'd ever seen before, and I've seen my fair share of crocs. :|

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Agama
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Unread post by Agama » Sat Mar 15, 2008 6:27 pm

gwendolen wrote:Crocs eat very little. They don't really need much food because they get their energy from the sun.

A somewhat misleading statement.
Crocodiles are like most reptiles poikilothermic.
In other words they rely on external factors, like the sun, to heat their bodies to the desired temperature.
Once they reach their desired temperature they thermo-regulate, moving into and out of water or into shade to maintain the desired temperature.
That is where it stops.
They do not tap energy from the sun that will enable them to survive with the minimum intake of food.
They can and do consume huge meals and in summertime eat regularly.
They, like all reptiles eat less frequent in the colder months of our winters and may in this time go without food for lengthy periods.
If they did not have ample food intake during the summer they may die during winter, because they do not have the reserves to see them through winter.
This may explain why one will sometimes see photo's of impala etc. in close proximity of crocodiles.
It may also explain why they have not eaten on the hippopotamus.
In cold weather the cannot digest food.
Regards, Agama

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Ludwig
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Unread post by Ludwig » Mon Mar 17, 2008 12:04 pm

Pilane wrote:Deformities are normally a result of injury.
Being part of a croc family is a risky buisness :wink:

Once I saw this one.
Image

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LadyRaven
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Unread post by LadyRaven » Mon Mar 17, 2008 12:16 pm

Aha! I found the picture!!

He was in the water by the Lower Sabie bridge.

Image

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Imberbe
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Unread post by Imberbe » Mon Mar 17, 2008 2:47 pm

Thats a perfectly normal crocodile. They develop these "knobs" and it gets more pronounced with age. The black "hole" is just a shadow. (See the shadows of the scales on his neck.)
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Agama
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Unread post by Agama » Tue Mar 18, 2008 10:03 pm

Crocodiles have both a septate lung and a diaphragm—an organ not found in snakes, lizards, or birds.
But the crocodile diaphragm is also somewhat different from that in mammals.
It is not muscular but is attached to the liver and movement of this liver/diaphragm acts like a piston to inflate the lungs, with muscles attaching to the pelvis.
(The mammalian [including human] diaphragm pulls the liver in the same way a crocodilian one does, creating a visceral piston, but the way this is accomplished differs in crocodiles and mammals..."
I Googled crocodile diaphragm and amongst others this came up. The scaly skin hides a lot of secrets!

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Pilane
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Unread post by Pilane » Wed Mar 19, 2008 6:13 pm

I know agama but it does fuction differently an also looks very different although called a 'diaphragm' by some. It is very different as you pointed out yourself and it should't be called a diaphragm as it is not a muscular partition.... The liver actually pull on this 'diaphragm' and not the other way around...
To breathe in, a croc has to move its liver and other organs backwards
:wink:

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shangri-la
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Re: Nile crocodile

Unread post by shangri-la » Tue Oct 21, 2008 4:09 pm

ImageLarge

Lion Buffalo and croc !!!!!! what a sight
Last edited by Elsa on Mon Jun 16, 2014 12:24 pm, edited 1 time in total.
Reason: pic resized.
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Re: Nile crocodile

Unread post by Nannie » Tue Jun 30, 2009 12:15 pm

Sunset dam's green "gremlin"

Image
Last edited by Nannie on Tue Sep 28, 2010 9:51 am, edited 1 time in total.

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Re: Nile crocodile

Unread post by Richprins » Sun Jul 26, 2009 8:01 pm

Image

Image

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bert
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Re: Nile crocodile

Unread post by bert » Sat Nov 07, 2009 11:53 am

Image

At Sunset Lower Sabie, where this guy gave me the hungry look.
When you are lucky they get real close to the shore & car

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oddesy
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Re: Nile crocodile

Unread post by oddesy » Sat Nov 07, 2009 11:59 am

Brilliant picture Bert!! :clap: :thumbs_up: nicely focused on the eyes :cam:
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Re: Nile crocodile

Unread post by Wild about cats » Mon Nov 16, 2009 6:58 pm

Okay, Im focussing on the guy in the background, the one in the front is just there to compare with
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oddesy
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Re: Nile crocodile

Unread post by oddesy » Mon Nov 16, 2009 7:18 pm

WAC that is one huge crocodile :shock: :shock: :thumbs_up:
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Johan van Rensburg
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Running the guantlet

Unread post by Johan van Rensburg » Mon Nov 30, 2009 2:13 pm

The recent wet spell in Kruger had (debatable) beneficial consequences for some... the rising water level causes a spawning urge in the African sharptooth catfish Clarias Gariepinus to start migrating upstream (normally) immediately after the first heavy showers of the rainy season... they love shallow water and vegetation to spawn in.

Such was the case at the causeway below the Pioneer hide near Mopani, Friday 20 November. However, “upstream” is restricted due to the dam wall, so, downstream became a viable second option. The catfish somehow sensed that their pond was overflowing, offering suitable spawning habitat on the downstream side of the causeway. They gathered there in numbers to cross over in the very shallow overflow. Soon the Nile crocodile realised there was one of its favourite food items on offer...

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Somehow the catfish detected the presence of the crocodile as well as that the best places to run the gauntlet being the shallowest part of the causeway.

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There couldn't have been more than 2 cm of water, but it was enough for the catfish to power across the causeway and into the safer portion of the stream where it would eventually participate in a spawning frenzy.

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The croc would react to the splashing, arriving at the catfish's departure point too late to be effective, while behind the crocodile, another catfish would sneak across. Eventually the croc gave up the effort and retreated, leaving the causeway to the catfish.

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Obviously we were rooting for the croc... I mean, the shots of a crocodile catch would have been much more exciting that those of sneaky catfish outmaneuvering the mighty Nile crocodile! :lol:

Read more about the effects the rain had on Kruger's animals.
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