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> It's a balance of nature. In this case wait until your prey has a full meal then eat him:
> 
> https://www.livescience.com/60836-sea-slugs-kleptopredators.html?utm_source=ls-newsletter&utm_medium=email&utm_campaign=20171102-ls
> 
> "A type of brightly colored sea slug has a taste for microscopic marine creatures called zooplankton, and it feeds on them using a method that's never been seen before: It captures quantities in a gulp by using a middleman.
> 
> "The sea slug's unsuspecting helpers are hydroid polyps — tiny, coral-like animals that live in colonies and gorge on zooplankton. And the sea slug, known as a nudibranch, treats the polyps as living fishing nets, avidly scooping them up and swallowing them down as soon as the hapless hydroids finish their zooplankton supper.
> 
> "The nudibranch Cratena peregrina is a common type of bottom-dwelling marine mollusk found in the Mediterranean and the Atlantic coastal waters near the Iberian Peninsula, Senegal and the Canary Islands. It measures about 1 to 2 inches (3 to 5 centimeters) in length, and has a pale body covered with colorful, elongated, fleshy spines called cerata, which help with respiration by increasing the surface area on the upper part of the animal's body.
> 
> "C. peregrina was previously known to feed on hydroid polyps, but the study authors discovered that the nudibranchs preferred polyps that had just eaten. In experiments, when presented with a colony of polyps that had just fed and a colony that was "empty," the sea slugs ate twice as many of the polyps that were full of zooplankton.
> 
> "In fact, kleptopredation provides the nudibranchs with enough plankton to account for about half of their diet, overturning previous claims that polyps were the nudibranchs' primary food source, according to the study.
> 
> "Their findings hint that nudibranchs may not be the only marine creatures to use this previously unknown strategy, and that predator-prey interactions in this group may be more complex than once thought, the researchers wrote. "
> 
> Comment: Clever trick, just watchful waiting. Probably a learned behaviour. Part of an eco-niche balanced system of nature.