Well as title suggest, it seems like Mountain Quails and California Quail has most likely been combined in the training data for "California Quail"
I'm no bird expert but: From a google search Mountain quails = stripes, California - no stripes.
And this is a continous issue for 1000s of images, probably becasue https://lila.science/datasets/nacti/ include both Mountain and California Quails under " California Quail" images such as - https://storage.googleapis.com/public-datasets-lila/nacti-unzipped/part1/sub100/CA-42_04_03_2015_CA-42_0000629.jpg