Are heron's predators?

[Bear Foot Farm]

Former the size of very young chickens.

Chickens that size would still be in a brooder​

 

[centrarchid]

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Chickens that size would still be in a brooder

Not everyone uses a brooder for all their production of chicks. Hens still used by some.

 

[woodmort]

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Great blue herons are the only ones that will hunt away from water and could present a potential threat to chicks.http://www.allaboutbirds.org/guide/Great_Blue_Heron/lifehistory
Green herons wouldn't be a threat. http://www.allaboutbirds.org/guide/green_heron/lifehistory
Night heron hunt at night and are smaller than blues. http://www.allaboutbirds.org/guide/black-crowned_night-heron/id
Marabou storks are predators whose bills are built to take large prey as opposed to the sandhill crane.
While all herons could present some threat to small birds they are not active predators in that department so unless one were keeping small ducklings they shouldn't be a problem.