Rhinoceros beetles show an amazing diversity in their horns, even within the same species (here, Trypoxlus dichotomus). Females lack horns, but males use them to fight each other.
A rhinoceros beetle shows off its antler-like horn.
Rhinoceros Beetle on a Leaf
A male rhinoceros beetle perches on a leaf.
Rhinoceros beetles gather on a tree. Males defend sap sites from other males, hoping to mate with females attracted by the sap.
Rhino Beetle Battle
Two male rhinoceros beetles lock horns in battle.
European rhinoceros beetle, called Oryctes nasicornis in the wild.
There are more than 300 species of rhinoceros beetles, representing a wide array of horn diversity.
Rhino Beetle Fight
Two rhinoceros beetles face off on a tree.
This image of a rhinoceros beetle in a child's hand illustrates the insects' size.
Male Rhino Beetle
A male rhinoceros beetle photographed in Ecuador.
Stephanie Pappas, Live Science Contributor
Stephanie Pappas is a contributing writer for Live Science. She covers the world of human and animal behavior, as well as paleontology and other science topics. Stephanie has a Bachelor of Arts in psychology from the University of South Carolina and a graduate certificate in science communication from the University of California, Santa Cruz. She has ducked under a glacier in Switzerland and poked hot lava with a stick in Hawaii. Stephanie hails from East Tennessee, the global center for salamander diversity. Follow Stephanie on Google+.