Pallas's could refer to any of the following animals, named after the biologist Peter Pallas:
Birds
Pallas's cormorant Pallas's fish-eagle Pallas's gull Pallas's grasshopper warbler Pallas's leaf warbler Pallas's reed bunting Pallas's rosefinch Pallas's sandgrouse
Mammals
Pallas's long-tongued bat Pallas's tube-nosed fruit bat Pallas's cat Pallas's squirrel Pallas's pika