Originally posted by WPRESTO FYI: The exact number of living bird species isn't know precisely - there may be unrecognized species; there may be two named species that are actually just color variants; there are certainly some very rare species that have gone extinct since they were last seen and counted - but, most agree there are about 10,000 species*. Tricky to know how to identify every one of them.
*One source attempted a precise count and came up with 10,404, with the addendum: it is probable that 101 of those on the list are now extinct.
Depending on whose classification you recognize, the total number of bird species in the world varies from about 9,000 to about 12,000.
---------- Post added 20th Aug 2018 at 11:55 ----------
Originally posted by rkappleby I have had some Crossbills recently - the first two photos appear to be a Red Crossbill while the third looks to be a White Winged Crossbill that seemed to be hanging around with the male ?? last two are a juvenile Red Crossbill female I think ....
I think you're right on all counts.
---------- Post added 20th Aug 2018 at 12:01 ----------
Originally posted by ChipB The crossed bill is a very interesting genetic development - neat to see the pics!
All the better to extract seeds from unopened conifer cones. Incidentally, some individuals have their bills crossed "right-handed" and others have their bills crossed "left-handed". In one species "right-handed" is most common, in the other species "left-handed" is more common. I'm not sure about "handedness" in the species of
Loxia outside of North America.