Are there any animals that don't need to eat to survive?

Not to grow and multiply but just to survive, the water bear. They can go about 30 years without eating and still survive.

No, every organism needs food for nutrients .

BUT many animals can survive withoud for long periods.eg- BEARS can go about 100 days without eating or drinking.

Eat is a very vague term and too imprecise for science. Consequently, you are receiving mixed answers.

All animals require nutrients. They are needed for two reasons. The first is to provide the materials for biosynthesis. The other is to provide substrates for respiration in order to synthesise ATP molecules. All animals are heterotrophs. They cannot synthesise the large, organic molecules they require from inorganic compounds in their environment.

In general animals have holozoic nutrition which means they ingest solid or liquid foods. There are exceptions to this.

No. All animal life consumes in some manner or form.

True, some animals in the Insecta class do not eat as adults, but do their eating in their larval stage.

No, water and food are essential for life.

Yes. They are obligate parasites: absorptive heterotrophy, with no ingestive heterotrophy in the entire life cycle.

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My favorite examples are the unicellular members of myxozoa.

https://en.wikipedia.org/wiki/Myxozoa

No. all animals are heterotrophs, meaning they cannot create their own food, unlike autotrophs like plants, algae and some bacteria, and must feed to get energy to survive, grow and reproduce.

Alligators can go two years without eating.

nope

Mayflies do not eat. They don't even have working mouths.