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And so, these goats ate the flora of the island: unique species of Indian paintbrush and woodland star, bushmallow and wirelettuce and morning glory. No wait, they were, but they had experienced so much genetic drift and selective pressure that they now constituted a unique breed in their own right.
In light of spring’s recent arrival, do you ever find yourself wondering how some species are able to withstand freezing, wintery days and yet still thrive in summer’s heat? Juncos breed in much of the U.S. This kind of detailed genetic and developmental work has traditionally relied on model species in the lab (aka chickens).
The feature distinguishes birds from other species; All birds have them, no other species do. Beaks vary across different kinds of birds, and this great diversity in beaks is part of the great diversity of the 10,000+ species of birds that exist today; Beaks thus facilitated the diversification of birds. Here’s the thing.
I tried to get a better idea of what exactly the definition of cuckoo-dove is but am still not very clear about it – Wikipedia only offers the rather formal definition “any of several species of bird in the genera Macropygia , Reinwardtoena, and Turacoena of the pigeon family.” But I may well be wrong.
The vast majority of the 10,000+ living species of birds are passerines, and the vast majority of those have a similar system of breeding: Mom and dad bird make a nest and share parental responsibilities roughly equally, if not identically. There are variations on that theme, of course. They looked at fairy-wrens and cuckoos.
Given how far Hokkaido is from Europe, it seems a bit surprising how many bird species wintering on this Japanese island have a name starting with “Eurasian” Or how many of these species I have also seen in my parents’ garden in Germany. In science speak, this is named the optimal body mass hypothesis.
The book is divided into three parts: “Introduction,” “Avifaunal Overview,” and “Species Accounts.” The authors’ detailed delineation of problems with the accuracy of NYC breeding bird surveys or with the limits of historical writings may test a reader’s patience. Most birders will go straight to the “Species Accounts.”
Hunting sandhill cranes in Kentucky is a bad idea from a public relations standpoint, considering the growing cadre of birders and nature enthusiasts for whom cranes are a touchstone species. Initiating a hunting season on a large, charismatic species like a crane is no way to resuscitate hunting.
Even if you don’t live in the summer range of a particular species, you may have opportunities to observe it while it passes through, especailly if you live in an active flyway, like I happen to. Because the ancestor of this species of bird migrated, and the migratory adaptation and all that entails were passed on.
According to Tim Low (in “Where Song began”), “so easy were they to breed that by 1859 they cost less to buy in London than in Sydney.” ” Funny how the difficulty of breeding a species can be illustrated in simple monetary terms. We even had some chicks – not that this was a big achievement.
The best female strategy seems to be to mate with as many of the males as possible, as this means more help in feeding the chicks by all the potential fathers (I guess the fathers do not have easy access to paternity tests). They found that the species is diurnal (well, using cameras, would they even have seen nightly activities?),
Phenology is a vital science. There’s some excitement in putting up feeders and in discovering which species are gracing us with big invasions this year (2011, Montana: Snowy Owls ) but much of the time its a slog. Among other things, it has provided some of the earliest and most compelling evidence for global warming.
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