DOLPHINESare known as an interesting creature in the world.they are known as very wise.here is the example of it.

"A trainer would come out onto the floating stage and a dolphin would perform a tail stand with a piece of trash in its mouth. The trainer would then reward the dolphin with a bit of fish.

"One day the lead trainer went through the routine only to notice that the dolphin kept coming back with a piece of trash even though the tank appeared clean. The trainer asked a colleague to go below to the engineer's port to observe what the dolphin was doing when a trainer came out on the float. The trainer came out on the float and sure enough, the dolphin quickly showed up with a piece of trash and got his reward.

"The scam was revealed! This dolphin had established a savings account of sorts। He collected all the trash and stuffed it in a bag wedged in a corner of the tank near the intake of the filtering system. In there was paper, rope, and all sorts of trash. The amazing thing is that when he went to the bank he did not simply take a piece, rather he would tear a bit off to maximize the return.