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Bianca Lavies

In this archival image, Richard Leakey and Meave Epps examine fossils on a rocky hillside near the northeastern shore of Lake Turkana as they attempt to piece together an early hominid.

Worker honeybees tend to a queen, identifiable by her longer torso. While worker bees live six weeks on average, a queen may rule and lay eggs in a hive for several years.

In this photo from the July 1975 issue, scientists round up tundra swans in Blackwater National Wildlife Refuge, Maryland. The birds, sometimes called whistling swans, were giving tracking bands so that their migration patterns could be studied.

The cover story from August 1976 documented the hunt to find the place in Mexico where monarch butterflies spend the winter, before migrating north again in spring. In this photo, they're still sluggish from the cold, so they rest on any available surface-- including this researcher's hat.