Perfect

Perfect information refers to the situation in which an agent has all the relevant information with which to make a decision. It has implications for several fields. In game theory, perfect information describes the situation when a player has available the same information to determine all of the possible games as would be available at the end of the game. In game theory, a game is described as a game of perfect information if perfect information is available for all moves. Chess is an example of a game with perfect information as each player can see all of the pieces on the board at all times. Other examples of perfect games include tic tac toe, irensei, and go. Games with perfect information represent a small subset of games. Card games where each player's cards are hidden from other players are examples of games of imperfect information.

Zebra

Zebras are several species of African equids (horse family) united by their distinctive black and white stripes. Their stripes come in different patterns unique to each individual. They are generally social animals that live in small harems to large herds. Unlike their closest relatives, horses and asses, zebras have never been truly domesticated.

There are three species of zebras: the plains zebra, the Grévy's zebra and the mountain zebra. The plains zebra and the mountain zebra belong to the subgenus Hippotigris, but Grevy's zebra is the sole species of subgenus Dolichohippus. The latter resembles an ass, to which it is closely related, while the former two are more horse-like. All three belong to the genus Equus, along with other living equids.

The unique stripes of zebras make these among the animals most familiar to people. They occur in a variety of habitats, such as grasslands, savannas, woodlands, thorny scrublands, mountains, and coastal hills. However, various anthropogenic factors have had a severe impact on zebra populations, in particular hunting for skins and habitat destruction. Grevy's zebra and the mountain zebra are endangered. While plains zebras are much more plentiful, one subspecies, the quagga, went extinct in the late 19th century, though they have now been rebred from zebra DNA.

Grasshopper Sparrow

Adults have upperparts streaked with brown, grey, black and white; they have a light brown breast, a white belly and a short brown tail. Their face is light brown with an eye ring and a dark brown crown with a central narrow light stripe. There are regional variations in the appearance of this bird.
Their breeding habitat is open fields and prairie across southern Canada, the United States, Mexico and Central America, with a small endangered population in the Andes of Colombia and (perhaps only formerly) Ecuador. The nest is a well-concealed open cup on the ground under vegetation.
The northern populations migrate to the southern United States, Mexico, Central America and the Caribbean.

They forage on the ground in vegetation, mainly eating insects, especially grasshoppers, and seeds.


This bird's song is a buzzy tik tuk zee, resembling the sound made by a grasshopper. Unlike some other members of the Ammodramus family of sparrows, they will readily sing from open and exposed perches. Like many grassland birds, this bird's numbers have declined across many parts of its range, including a 98% drop in New York State.