Many plants do similar things. Black walnut trees load their roots and nut hulls with a toxin which seeps into the soil and kills or damages competing trees and plants. Many conifers line the ground around them with a thick blanket of needles which acts to suppress competitors. Some load the blanket with flammable resin, encouraging regular forest fires which only large, mature trees can survive.
Competitive adaptations are also common in cultural evolution. Some examples:
- "Thou shalt have no gods before me" is a famous example from Christianity.
- The Bible also features a prohibition on idolatry, with a similar intent:
You shall not make for yourself an idol, or any likeness of what is in heaven above or on the earth beneath or in the water under the earth. "You shall not worship them or serve them; for I, the LORD your God, am a jealous God, visiting the iniquity of the fathers on the children, on the third and the fourth generations of those who hate Me, but showing loving kindness to thousands, to those who love Me and keep My commandments.
- One way of exterminating the competition is killing their human hosts. Islam has plenty of examples of this with its holy war on infidels and repeated calls to violent action against unbelievers.
- American elections heavily feature negative advertising, whose sole purpose is destroying the competition. For a famous example see the daisy girl video.
- There are so-called Anti-competitive practices whose function is to eliminate competition. These are actually forms of competition in which organizations sabotage their competitors in various ways - often in the hope of eliminating the competition altogether and gaining a monopoly.