| The three-spine stickleback is a fish known for its tremendous variability in size, physiology, and behavior. |
| Sixty years ago the great ethologist Niko Tinbergen noticed a stickleback fish aggressively displaying toward the window of his fish tank. |
| In the open water, long spines help protect the stickleback from being swallowed by large predators. |
| Examples include the red markings of salmon, stickleback, and guppies, in addition to many birds. |
| As we walk to the edge of a stream, a stickleback freezes, then darts away in a series of rapid zig-zags punctuated by brief pauses. |
| Make a big deal of the last stickleback. This game simulates the situation at Hadley Lake situation where the stickleback are made extinct. |
