Celebrating Science & Humanity

Portrait By: G. Richmond


Darwin Day is a global celebration of science and reason held on or around Feb. 12, the birthday anniversary of evolutionary biologist Charles Darwin.

On this website you can find all sorts of information about Charles Darwin and the International Darwin Day Foundation. If you are hosting a Darwin Day event, you can post information about it on our events listing. You can also locate Darwin Day programs near you by searching our events section.

We also have resources for hosting Darwin Day events, including promotional support and a list of potential Darwin Day presenters.

Click here to read more about the history of the International Darwin Day Foundation.

Darwin Day Profile: Dr. Robert Stephens

Dr. Robert Stephens came up with the idea for Darwin Day in 1993 and co-founded the Darwin Day Program. Read his interview with Humanist Network News editor Maggie Ardiente on the early days of Darwin Day.

Lecture 31: Why So Many Species? The Factors Affecting Biodiversity

One can look at biodiversity from several perspectives. An ecological point of view tries to determine how necessary diversity is for an ecosystem to function. An economic point of view tries to capture the value of the “services” nature provides for mankind. An evolutionary point of view shows how artificial the human “right” to dominance is. Finally, a personal point of view captures the emotional basis for the values that humanity place on biodiversity.

Lecture 32: Economic Decisions for the Foraging Individual

There are several ways to examine the behaviors of organisms when they forage or hunt for food or mates. These behaviors become more complex in higher organisms, such as primates and whales, which can hunt in groups. Foragers and hunters have been shown to examine the marginal cost and marginal benefit of continuing an action and then adjust their behaviors accordingly. They are also able to handle risk by hoarding resources.

Lecture 33: Evolutionary Game Theory: Fighting and Contests

The economic concept of game theory can be readily applied to evolution and behavior. By analyzing encounters between organisms as a mathematical “game,” important information such as fitness payoffs and the proportions of “strategies” played by each group within a population can be inferred. While oftentimes these games are too simplified to apply directly to actual examples in nature, they are still useful models that help to convey important concepts.

Lecture 34: Mating Systems and Parental Care

Mating systems and parental care vary tremendously from species to species. Every species differs in how it protects its young from predators and provides its young with food, if it does so at all. The physical environment as well as behavioral dynamics in intra-species relationships all influence parental care. Often the mating system, which sex is dominant in mating, and whether fertilization is external or internal will determine much of the process of parental care.

Lecture 35: Alternative Breeding Strategies

Breeding strategies differ both among males and females of the same species as well as among different species. The difference in breeding strategies among members of the same species can usually be linked to frequency dependence. If the species is at evolutionary equilibrium, the relative fitnesses of these different strategies will be identical. Differing strategies have been found at the level of the gamete as well as at the level of different organisms and species.

Lecture 36: Selfishness and Altruism

Originally, altruism and self-sacrifice were thought to be incompatible with natural selection, even by Darwin. Now we have several explanations for how altruism can increase an individual…

Discussion Topics

Discussion Topics for Your Darwin Day Event

Event Ideas

Ideas for your local Darwin Day Event