This animal, the most famous of marsupials, is excellent at jumping.
What is a kangaroo?
100
This is what happens when you see the same thing again and again, and get used to it.
What is habituation?
100
This phylum includes both birds and people.
What is Chordata?
100
These are scents released by animals as a form of communication.
What are pheromones?
100
This happens when there's too many organisms in too little space, and they must fight over resources.
What is competition?
200
This animal isn't a porcupine, but it is sometimes called a "spiny anteater."
What is an echidna?
200
It's the name of a vehicle and also the behavior of moving directly toward something.
What is taxis?
200
These extinct animals are the ancestors of birds, and are very popular among kids.
What are dinosaurs?
200
This is information that can cause a reaction in an organism.
What is a stimulus?
200
These come in three basic categories: energy, risk, opportunity. Each behavior has them.
What are costs of behavior?
300
This animal is a mammal, but you wouldn't guess that on first glance.
What is a platypus?
300
Before doing this behavior, you should make sure to grow fatter - you'll need it to survive. It'll keep you safe through the winter.
What is hibernation?
300
This type of feather can be plucked from the parent to line its nest.
What is down?
300
This behavior is praised in every kindergarten, and improves the fitness of all individuals involved.
What is cooperation?
300
This behavior reduces your fitness, but it increases the fitness of the group - that alarm call told the predator where you were, but your colony will escape safely.
What is altruism?
400
Many people find this animal cute, but it's got sharp teeth and claws. Try a plush version to hug instead.
What is a koala?
400
The most famous example of this process involves dogs and ringing bells.
What is classical conditioning?
400
This bird body part helped scientists study evolution and natural selection within the scientists' lifetimes.
What is a beak?
400
This type of group involves castes, where each caste has a different purpose: reproduction, defense, food-gathering, etc.
What is a eusocial group?
400
This theory states that natural selection favors behaviors (and therefore the creatures who perform them) that can get the most nutrition with the least effort.
What is optimal foraging?
500
This is a mammal of a group with only three surviving species left, all in Australia, Tasmania, and New Guinea.
What is a monotreme?
500
This can manifest as a red dot on the beak of a bird, which baby birds peck at to make their parents regurgitate food.
What is a releaser?
500
This animal builds elaborate structures from twigs and fills them with shiny and colorful objects, all to attract a mate.
What is a bowerbird?
500
This is the process of sacrificing some of your own fitness in order to keep your family alive - if you die, at least the genes you share with your family will live on.
What is kin selection?
500
If this happens wrong, it can cause a young animal to grow up thinking it's a different species and be unable to recognize members of its own species as mates.