A nature observation becomes more useful when someone else can understand what was observed, where, when and under what conditions. A striking photograph

An original field-notebook template for careful local observations, with uncertainty, effort and limits on ecological conclusions.

Small fossil teeth can support a nursery hypothesis, but tooth position and regional size differences complicate the inference. They do not reveal parental care.

Cleaner-fish experiments reveal flexible responses to partners and barriers, while leaving room for more than one explanation of the behavior.

Feather structure, surface chemistry and preening help ducks shed water. Learn what the evidence shows and how to observe plumage without disturbing wildlife.

Holiday cacti respond to light, temperature and water. Explore why starting a flower bud differs from developing it into an open bloom.

For bottom-dwelling animals, the timing and transport of larvae can matter as much as adult habitat. Original research challenges a simple northward-migration story.

Cultivated strawberries have eight chromosome sets, but that does not mean eight identical copies of every gene. Understand the count, hybrid history and limits of the claim.

Large skulls and jaw fragments reveal enormous marine reptiles, but a measured bone and an estimated body length are different kinds of evidence.