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Why no tusks? Poaching tips scales of elephant evolution

A hefty set of tusks is usually an advantage for elephants, allowing them to dig for water, strip bark for food and joust with other elephants. But during episodes of intense ivory poaching, those big incisors become a liability.

The Immune System

This interactive module introduces the anatomy of the immune system and walks through the timeline of a typical immune response.

Cell Biology
Anatomy & Physiology
Click & Learn
High School — General
High School — AP/IB
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Beetle keeps rivals off scent of food buried for offspring

Some beetles roll the flesh of dead animals into a ball and cover it in goop — all to feed their future offspring. Now scientists think that goo might do more than just slow decay. It also appears to hide the scent of the decomposing bounty and boosts another odor that repels competitors.