Day 88: Houses have shingles, therefore this bird is purple.
Okay, I imagine some of you are having a hard time with that statement, but it is perfectly reasonable when you have all the data. This is a Purple Finch (Carpodacus purpureus). It has a close cousin in House Finch (Carpodacus mexicanus) and can be difficult to distinguish from it where the two species overlap in range. The key is in observing the bird's flanks and breast. House Finch has much sharper markings; the flanks in particular are patterned with distinct dark streaks, i.e., the "shingles" on the House. If you remember that one key phrase "Houses have shingles," you should have no trouble telling them apart in the field, even if the mnemonic confuses your non-birding friends.
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