Summary
Reciprocal adaptations such as bat echolocation and moth hearing escalate over evolutionary time.
In depth
The life-dinner principle: prey run for their lives, but predators for a meal. Examples: tiger moths clicking to jam bat sonar; newts producing tetrodotoxin and garter snakes evolving resistance.
Arms races involve escalating adaptations at both sides with costs; asymmetry means selection may be stronger on prey. Chemical defences and resistance in predators often show geographic mosaics.
Remember: both sides evolve, but the end result is often stalemate.
Predators and prey exert reciprocal selection, producing escalating adaptations. A famous case is the bat and moth: bats use ultrasonic echolocation, many moths evolved ears sensitive to those calls and erratic flight, and some bats responded with calls outside moth hearing range or quieter calls.
The life-dinner principle (Dawkins and Krebs) suggests prey often evolve faster because a failed prey loses its life while a failed predator loses only a meal. Other examples include newts and garter snakes, where toxin levels in newts and resistance in snakes escalate.
Example: some tiger moths produce clicks that jam or warn bats.
Key idea: coevolution can be a long-running race without a final winner.
Frequently asked questions
What is Predator-Prey Arms Races?
Reciprocal adaptations such as bat echolocation and moth hearing escalate over evolutionary time.
Which area of biology covers Predator-Prey Arms Races, and how advanced is it?
Predator-Prey Arms Races is one of the 53 topics in Animal Behaviour. It is rated Advanced, so it suits learners who want specialist depth. Related topics in this area include Sexual Conflict, Communication, Brood Parasitism.
Can you give an example of Predator-Prey Arms Races?
Geographic mosaic of coevolution in newt-snake populations.
What should I learn before Predator-Prey Arms Races?
Work through the Beginner topics in Animal Behaviour first, such as Animal Behaviour, Innate Behaviour, Learned Behaviour, then return to Predator-Prey Arms Races. Advanced topics assume the Intermediate vocabulary.
What topics are related to Predator-Prey Arms Races?
The closest topics to Predator-Prey Arms Races are Sexual Conflict, Communication, Brood Parasitism, Behavioural Ecology of Signalling. Comparing them side by side is a good way to see how the ideas connect.
How can I check that I understand Predator-Prey Arms Races?
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Predator-Prey Arms Races. To practise the whole of Animal Behaviour, use the Animal Behaviour quiz.
How is Predator-Prey Arms Races different from Sexual Conflict?
Predator-Prey Arms Races: Reciprocal adaptations such as bat echolocation and moth hearing escalate over evolutionary time. Sexual Conflict: Differences in the evolutionary interests of males and females drive arms races in mating traits. Read both side by side and note what each one explains.
How should I study Predator-Prey Arms Races step by step?
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Sexual Conflict and explain the difference aloud. Finally, take the Animal Behaviour quiz and come back to this page for any question you miss.