Tarantulas are one of the most well-known types of spiders. There's a reason fake tarantulas are sold at Halloween — some people think they're creepy. But others like them and keep them as pets.

Chimera, you might whisper. Half-sider. Or perhaps you already know what a scientist would say: gynandromorph. Most rare. As their name suggests, gynandromorphs (gyn meaning female, andro indicating ...