Excellent. I used to live in Brazil, home of the Piranha. They were common in lakes and dams in our state of Minas Gerais: the young ones harmlessly nibbling the toes of bathers. However, recently the government of Papua New Guinea has released the hitherto harmless Pacu into certain river systems there, and it has become carnivorous and a danger to people, as seen on popular TV shows about giant river fish. The reason for the diet switch is thought to be lack of food.

Vegetarianism was the original intention both for humans and animals, so do humans who do not eat meat stand a better chance of entering the Kingdom of Heaven?

The Lord as the Grand Engineer, who engineered the universe, its laws and its inhabitants, no doubt could foresee the various hostile environments that would arise, must have engineered the code with lots of information and variability to enable it to survive. Thank you for your insights.

Piranha also has a job to do. They clean the rivers from species which died in the "Pororoca", a phenomenon the occurs in a certain time of the year when the sea and the river met together with a might strength and leaves few species floating. So they have an important job to do. Nothing happens outside a purpose.

A friend of mine used to have several pacus in a large fish tank. Fascinating to watch, especially when lettuce was placed in the tank. They would eat just like piranha.

I have had "Red Bellied" Pacus (2) in a large fish tank of mine. They were primarily fed a well balanced pellet food, but it was interesting what they did with fresh meat. I had a Koi that fit very well with the Pacus but one day I had the opportunity to purchase a full grown Flowerhorn (a cross bred cichlid approx. 12" long). These fish are well known for their territoriality but it lived harmoniously for a few weeks then decided to take out the Koi. It only killed the Koi but sent the scent of fresh meat through the tank. The Pacus proceeded to casually observe the Koi for quite a long time. They didn't flurry but when they did grab the carcass they vigorously shook and twisted chunks of meat off. It was very Piranha like with a very laid back approach, but I did see the glaring relationship they share with the Piranha. They are very fascinating creatures.