When: September 16
National Guacamole Day celebrates the avocado-based dip that has become an essential part of American appetizer culture — fresh, vibrant, and always the first bowl to empty.
The avocado survived extinction and shouldn't technically exist in the wild anymore. The animals that dispersed its seeds died off 13,000 years ago.
The avocado presents a genuine evolutionary mystery. Its seed is enormous — far too large to pass through the digestive system of any animal currently alive. In the natural world, fruit exists to tempt animals into eating it, then dispersing the seeds elsewhere. But no living creature can swallow an avocado pit whole and deposit it in a new location. Biologists call this an "evolutionary anachronism": the avocado evolved its giant seed to be eaten and dispersed by Pleistocene megafauna — ground sloths the size of oxen, gomphotheres (a prehistoric elephant relative), giant glyptodonts. When these animals went extinct roughly 13,000 years ago, the avocado should have declined and disappeared. It survived only because humans found it, valued it, and began planting it deliberately. We saved the avocado from extinction. The Aztec word "ahuacatl" means both avocado and testicle — the Aztecs named the tree for the way the fruits hang in pairs from the branches. Spanish colonizers, finding...