How a Python Can Swallow a Crocodile

Posted on Mar 5 2014 - 9:46am by IBC News
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                                                          Snakes regularly eat items 75 to 100 percent their size.

An olive python has a Johnson’s crocodile in a stranglehold, as seen in a mobile phone image from Queensland, Australia.

These photos suggest two monstrous animals battling, and then a snake that might just regret its meal later. Is this a rare moment that someone happened to capture or just a standard day in the wild?

First, these animals aren’t giants.

That snake is likely about 15 or 20 pounds [7 to 9 kilograms], and the croc might be 5 to 7 pounds [2 to 3 kilograms], probably three feet [one meter] long. And for these species, native to that part of Australia, this is a very natural event. While that looks like a really big meal, it’s a pretty common one for that type of snake. Olive snakes are known for being phenomenally powerful, pound for pound, and for feeding on large food items.

What danger is there to the snake in this scenario?

Teeth. The croc’s teeth could razor right through that snake.

If the croc could then shake its head, it could do real damage—but it probably wouldn’t have that chance here. That’s one reason snakes intentionally go for the neck and shoulder region when they attack, to try to avoid being bitten themselves. They’ll grab on just behind the skull and coil up to hold the croc in place. But even if a snake is bitten, it has a phenomenal immune system and can fight off many infections. We see huge scars on wild snakes; they do get beaten up by their prey.

Would the snake always win in this scenario?

Not necessarily. Both of these are apex predators in their environment. Big Johnson’s crocs eat little pythons and vice versa.

How does a constrictor like a python know when it’s “safe” to let go and eat?

Snakes are very sensitive to their prey’s heartbeat. Normally a python will constrict until the animal asphyxiates and the heart stops. But crocs can go a long time without oxygen. In this case I’d guess that the snake constricted with such force that it compressed the chest cavity until the croc’s heart had no room to beat. So the croc probably died of cardiac arrest rather than suffocation.


We always hear that snakes can “unhinge” or dislocate their jaws to eat big food. Is that what’s going on?

No. Snakes have no chin, no chin bone, so their jaws aren’t connected the way ours are. There’s nothing to dislocate. Instead there are really stretchy ligaments that determine how wide the mouth can open.

Snakes seem to “know” to eat their prey from the narrowest point—the mouth end—which makes the animal easiest to swallow; is this instinctive?

There’s probably some instinct at work there. It’s a particular behavior you see with snakes in the wild and captivity. After killing the animal they’ll let go and rest. Then before eating they’ll search around using their nostrils and tongue to find the smell of saliva from the animal. That’s the end they want. With crocs there isn’t saliva per se, but maybe the smell of mucus does the trick.

What’s the biggest prey item you’ve heard of one eating?

It was a scrub python—closely related to olives—that ate a wallaby that was about 110 percent of its body weight. That was a good-size meal. But snakes regularly eat items 75 to 100 percent their size.