Use 'peckish' when you're only a little hungry, not starving or very hungry.

Mild Hunger

'Peckish' is casual; it fits well in informal chats, not formal or academic writing.

Informal

'Peckish' is mostly used in British English, less so in American English.

British Usage

 When the sleeper cichlid feels peckish, it sinks to the lake floor and lies motionless, its splotchy coloration making it seem like a rotting carcass. If a small scavenger investigates, this undead trickster strikes.

The surprising reasons...

 at chops I definitely think she's quite peckish he's watching these little jackals now they're jackals are very fast so they would be able to escape from her almost always