.
Using cars to open walnuts
Living in California and Japan
Eating clams on the seashore
Sitting on electric wires
New Zealand keas drop rocks on the roofs of houses.
An African grey parrot knows when to use the word “no.”
A jackdaw named Jack rides on the mirror of a moving car.
Birds sometimes build multiple nests under the same flower pot.
Dropping rocks on houses'roofs
Luring badgers to beees' nest
Ripping off windshield wipers
Throwing clams onto the seashore
Complex societies make animals smarter
Animals rely on communication with others
Birds use animals and humans to get their food
All birds have different levels of intelligent play
Each generation of birds is smarter
All birds have some level of intelligence
All animals are becoming more intelligent
The parrot is the most intelligent of all birds
Play
Study
Cause
Involve
an impression
A conclusion
A mistake
An understanding
A person who studies behavior
Someone who trains animals
One who imitates others
One who remains silent
A plan for finding a way to do something
A game that shows something's intelligence
An unexpected and sharp change
A small difference in the form of something
A state of being completely full
A quality of being hidden
A condition of extreme intelligence
The quality of being complicated