I read somewhere years ago that the young crossbills bills cross at about 3 weeks, and they can cross either left or right, with no apparent reason (just like humans left-right handedness?)
Davis. in Larimer County with only 15 Cassin's Finches. -- You received this message because you are subscribed to the Google Groups "Colorado Birds" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/cobirds/CAGiNt0DEXHc8mUkOBCjgJRLJb-pKxaVF0JJVkA2VjQE9r8HMpQ%40mail.gmail.com.
