I'll just add a little bit to the excellent responces you've had so far. Keep in mind, these are observations from my own personal experiences, and my own experiences ONLY. This is certainly not to be taken as law. With that....
My experience with Oxyuranus and Dendroaspis is as follows:
1.1 cbb juvenile O. s. canni (>1 year)
1.0 w.c. 7' O. s. canni (1 month)
1.0 cr 7' D. polylepis (kept for a short time for a friend)
0.1 ch D. angusticeps (~1 year)
1.0 w.c. 5' D. angusticeps (1 month)
1.0 w.c. 6.5' D. viridis (4 months)
0.1 w.c. 7' D. viridis (>1 month, acquired with severe oral stomatitis)
Honestly, of all these, only the large male D. viridis made me terribly nervous to deal with. But to address what you've asked about...
I've only dealt with the one polylepis so I won't comment other than to say that he was a total "kitten" compared to most of the other large elapids I've messed with. He was a very long term animal, so what they say about polys calming down in captivity did hold true for that one particular snake.
As for the taipans though, I feel I have enough experience to comment further. The adult male was bought as a fresh import and arrived in immaculate condition. Unfortunately, I took this for a sign of him being healthy and didn't pursue any automatic round of anti-parasitic medicine. Needless to say, this was a mistake, and the seemingly healthy snake went from great to dead within a day once symptoms were apparent. Lesson here: check all w.c. snakes' fecals no matter how they look outwardly and medicate accordingly!
The two little guys were cbb animals, and were roughly 1.5' when I acquired them. They were spirited initially, but not bad at all to deal with. They would ride a hook well enough, and hooking and tailing was actually easy. Feeding time was always interesting from day 1. They had very eager feeding responces and would fly out of the hide to nab any food they detected. As time went on and they added size, things began to change. The once easily hooked snakes began sliding off hooks like they were greased. Not only that, but hooking and tailing them became completely out of the question as SOON as I discovered (or they did) their new method of "flopping" back on their own bodies to guard their tails. If I bumped their tail with the hook to lift it, they would appear to 'clumbsily' flop head over back, and within a fraction of a second, the head would be where the tail was, ready to defend it. If I remember correctly, this began happening when they were roughly 2.5' in length and I'd had them for a few months. At this time, I began using a set of Mighty Midget tongs and a hook to handle them. During this time, they also began to change in temperament from moderately flighty and skittish to flighty and confrontational. They'd actively approach the front of the glass and ram it if they thought they had a chance. Also, feeding responces began to get more and more excitable to the point of the snakes' anticipating your introduction of prey once it was detected. At this point, I began using the Mighty Midgets to introduce food, rather than the 18" hemos I had been using prior.
By the time I made the decision to get out of hots, late summer of '04, the taipans and a few boomslangs were the only things I had left. Almost as a parting farewell, the male taipan really gave me a run for my money when I was packing them up for shipment. He managed to squeeze out of the tongs and land on the floor. Things were quickly righted, but it was the closest call I'd had with them.
Despite how horrible that all sounds, I really enjoyed keeping them. Yes, they are dangerous as hell. No one can deny that. In my eyes, they are simply the most dangerous snakes on the planet, bare none. Someone asked earlier why on earth anyone would want to keep such "plain looking" deadly snakes, and that's a really tough question to answer. Yes there are people who like them for the supposed macho factor. For me though, the allure of taipans is an overall aspect of their nature. I personally find them to be beautiful while having a personality and manner of movement unlike any other snake. Or most others at least. Working with them certainly comes with a risk though, to be sure. One that could easily spell death for the keeper, especially here in the US.
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Chance Duncan
www.rivervalleyexotics.com