
1) Refs, at times
Found on
https://www.crosswordclues.com/clue/whistlers

archaic or obsolete terms > General: Cheater, deceiver, beguiler, especially one that uses false cards, or dice.
Found on
http://www.skyscript.co.uk/glossarytt.html

Large, round-headed songbirds with slightly hooked bills; whistlers are known for their explosive, often-beautiful, songs. The nearly 40 species of whistlers, along with shrike-thrushes, pitohuis, and a few related species, form the family Pachycephalidae, which is found primarily in the Australasian region.
Found on
https://academy.allaboutbirds.org/bird-academys-a-to-z-glossary-of-bird-ter
No exact match found.