Bendire's Thrasher
Toxostoma bendirei
Because of its similar coloration and structure to the curve-billed thrasher, the two birds are very easy to mistake for one another. The Bendire's thrasher's shorter bill is a distinguishing feature when comparing mature birds, but it is still easy to misidentify an adult Bendire's thrasher as a young curve-billed thrasher as its beak has not grown to a mature length. The Bendire's thrasher's yellow eyes and pale-based lower mandible are additional markings which aid in separation from the curve-billed thrasher. Voice: Like other mimids, the often silent Bendire's thrasher incorporates the songs and calls of other species into its own songs. A sharp "chek" is the species' most common call.
ID text from Wikipedia, CC BY-SA 4.0

Grey Thrasher
Toxostoma cinereum
The gray thrasher is 21.4 to 25.0 cm (8.4 to 9.8 in) long. Four males weighed 58.6 to 69.8 g (2.07 to 2.46 oz) and a female 54.4 g (1.92 oz). It is gray-brown above with cinnamon tones on the rump. Its underparts are white with arrow-shaped black spots. The outer tail feathers have white tips. Its eyes are golden yellow. The subspecies are similar, with T. c. mearnsi being somewhat darker overall. Voice: The gray thrasher's song is "a loud, fairly scratchy warbling...repeated two or three times"', and often sung from a high open perch. Its calls include "a rolled, rippling to rough whirr-rr-rr or chirr-rri-rrit, and a gruff chrek".
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Bendire's Thrasher and Grey Thrasher.