The Infaranea spider

There are some animals out there who use a part of themselves as a lure for prey. Angler fish females with their glowing lures on their heads and Alligator snapping turtles with the tongue that looks like a worm which they wriggle to tempt fish to come too close, are just two examples.
The Infas Aranea spider has a growth on it's head that looks like a human child. The spider buries most of his body close to areas it knows humans might pass (or animals that prey on humans). It wriggles its head and mandibles to make it look like a helpless abandoned baby. The Infas Aranea can also emulate the sound of a human baby quite accurately, making sure every potential prey in earshot is aware of it. When the curious meal to be comes close enough, the spider lunges with blinding speed and tries to inject its venom with a bite. The poison is a powerful paralytic that allows the spider to carry his prey back to its burrow with little resistance.
Bon app the teath!