urbpan: (boston in january)

Yesterday was perfect weather for tracking: a small amount of snow overnight, just below freezing during the day so that the tracks didn't melt and distort, and overcast so that photos of the snow didn't white out. Maggie is noticing something. What is it?

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urbpan: (marmot)

Eastern cottontail Sylvilagus floridianus

Every zoo has animals that come in from the surrounding city or countryside. They aren't caged, they simply take advantage of the protection and resources (food, water, shelter) that a zoo provides. At San Francisco Zoo I noticed the gulls; at Honolulu it was black-crowned night-herons. Zoos worldwide have rats and mice, house sparrows and starlings, pigeons and mallards. At Franklin Park Zoo there are cottontails. The native rabbit of the east coast of North America can be seen furtively chewing clover in a yard in front of an exhibit building, or lounging under the knotweed, much more confident than a country rabbit that worries about dogs and other troubles.

The eastern cottontail was featured in the 365 urban species project.

On this day in 365 urban species: cucumbertree.
urbpan: (fox eyes)

The baby ducks are huge! The Canada goose protects them fiercely.


The cottontail is on exhibit! This picture is to prove that you can sometimes see him--like right when we open or close, he spends the rest of the time hiding in his tunnel.
urbpan: (deer)
At my work, there is a recurring report from people tracking animals in the snow; a bizarre and lurid claim of blue rabbit urine. After six winters there, I have finally witnessed this first hand. Before seeing the blue stain on the snow myself, I was frankly skeptical, and assumed that people were seeing something else, and mistaking it for blue rabbit urine.

A quick search turns up one article on the phenomenon--posted by an "urban field ecologist," no less--from the previous winter. You can read it here: http://nuthatch.typepad.com/ba/2005/12/blue_smurf_pee_.html Another reference to this, with anecdotal experimental information is here: http://www.ont-woodlot-assoc.org/sw_nonfibre_redskies.html

The gist of it, is this: Our native rabbits (the eastern cottontail) have been browsing on an alien shrub (European buckthorn). The buckthorn contains a chemical that passes out with the urine, which comes out yellowish to brownish, but after exposure to sunlight, turns a lovely blue color. This effect is visible, of course, because the urine in question is suspended in snow. You would think that the cottontails are eating the berries of the buckthorn, because they are purplish, but according to the second reference above, the effect occurs after the rabbits eat other parts of the plant. Buckthorn holds its leaves long after most native deciduous plants, and in winter cottontails subsist largely on bark and twigs. The second reference also emphasizes that buckthorn is not a favored browse plant of North American herbivores, and that they have to be driven to feed on it out of desperation. I'm not sure about that; my workplace has enough Norway maple saplings to sustain a cottontail factory farm.

So, without further ado (okay, one doo) here is some blue rabbit urine:

urbpan: (Default)
I found urban wildlife before I even left to go to the field site:

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urbpan: (dandelion)

Photo by [livejournal.com profile] cottonmanifesto. Location: Franklin Park, Boston.

Urban species #168: Eastern cottontail Sylvilagus floridanus

Encountering a rabbit in the city tells us more about that city than it does about rabbits. It indicates that city values green space, and contains parks with open areas and relatively undisturbed fields and rough shrubby woods. The eastern cottontail is common enough in the suburbs and countryside of the northeast, but is not thought of as an urban species by most people. Similar to rats and mice in their ability to breed prolifically (sexually mature at 2-3 months, litters of up to 8, up to 4 litters per year), they are restricted by their habitat needs. They require undisturbed cover in order to breed--old stone walls, or overgrown shrubs and brambles. Boston's Emerald Necklace contains many linear miles of cottontail habitat, from Franklin Park, where we saw one today, up through Jamaica Plain, Brighton, and the Charles River Esplanade. I even saw one nibbling the weeds next to the Science Museum one afternoon.

Other cities may have other rabbits. The European rabbit (from which pet and meat rabbits were domesticated) has been introduced to many places, including, disastrously, Australia. They are common sights in the hedgerows and fields near cities in that continent as well as throughout Europe and Asia. In North America, our native rabbits are called cottontails to distinguish them from their Eurasian relatives. In the North and West of North America there are hares and jackrabbits, longer-legged lagomorphs that may take long strides through the edges of cities in those areas. All rabbits need a variety of plants available to feed on, and cover in which to hide. Cities that provide these sufficiently may also have rabbits.

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