Cockatoos use two separate tools to retrieve a cashew from a puzzle box.
Dolphins fishing with human fishermen in Brazil improve the fishermen’s catch by 17-fold by driving the schools of mullet into the nets and signaling the fishermen when to toss their nets out. Dolphins hunting with humans had a 13 percent increase in survival rate over other dolphins. These cooperative dolphins are more likely to stay near the shore, reducing their chance of entanglement in illegal fishing gear. Not to mention they can grab some mullet out of the nets.