The heavily armoured scales of the fish enables it to live in piranha-infested lakes, where no other animals would survive. Ironically, since it does tend to live near the surface, it also means it's easy prey for human predators.
|Credit: Arvid Puschnig|
This 'animals' have clear blood and can also breed with itself.
In Chile, they are fished commercially, and the locals eat them raw or cooked with salad and rice because apparently they’re delicious even thought they contain high concentration of vanadium, up to 10 million times that of the surrounding seawater. Vanadium is a heavy metal considered toxic at any more than incidental levels. Just why and how these creatures are able to accumulate vanadium in such huge quantities remains unknown.
|Bonobos mating, Jacksonville zoo, FL.|
They live in the Congos and are not in too many zoos for obvious reasons. Their sexual behaviour is said to be too human-like for most of us to be comfortable with.
“We have a lot to learn from [bonobos], because they’re a very egalitarian society and they’re a very empathetic society. Sexual behavior is not confined to one aspect of their life that they set aside. It permeates their entire life.” - Susan Savage-RumbaughBonobos do not form permanent monogamous sexual relationships with individual partners. They also do not seem to discriminate in their sexual behavior by sex or age, with the possible exception of abstaining from sexual activity between mothers and their adult sons. When bonobos come upon a new food source or feeding ground, the increased excitement will usually lead to communal sexual activity, presumably decreasing tension and encouraging peaceful feeding
After filling itself up with water during a wet season, the frog then burrows itself underground up to depths of over 1 meter (3 ft.)! The frog then creates a burial-like chamber by shedding it's skin in one piece and cocooning itself inside of it as it prepares to go into a coma-like state until the next rainy season. They have been known to live underground without food or water for up to 2 years or more! However, for additional nutrition and to save energy, the frog will eat this external skin.
Australian Aborigines discovered a means to take advantage of this by digging up one of these frogs and squeezing it, causing the frog to empty its bladder. This dilute urine--up to half a glassful--can be drunk. However, this will cause the death of the frog which will be unable to survive until the next rainy season without the water it had stored.