There isn't a single rainforest tree that specifically "kills" other trees in the way a predator kills prey. However, some rainforest trees are known for their aggressive and competitive nature, utilizing various strategies that can indirectly harm or outcompete others. Here are a few examples:

* Strangler Figs: These fascinating plants start their lives as epiphytes, growing on the branches of other trees. Over time, they send down roots that eventually encircle the host tree, blocking sunlight and nutrients. The host tree eventually dies, leaving the fig to stand on its own.

* Cecropia Trees: These trees produce a chemical that inhibits the growth of other plants around them, giving them a competitive advantage in the race for resources. This is known as allelopathy.

* Large Canopied Trees: Giant rainforest trees like kapok trees can block out sunlight from smaller trees below, effectively preventing them from growing. This is a natural form of competition for resources.

It's important to remember that the rainforest ecosystem is a delicate balance. While some trees might have strategies that appear aggressive, they play a role in the overall health and diversity of the forest.