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Red Fox Pups Establishing Hierarchy

4-27-18 red fox kit3 IMG_7484When Red Fox pups are born, they weigh less than a stick of butter and have charcoal gray fur (with the characteristic white-tipped tail). Eventually eyes open, fur grows more dense and teeth begin to come in. For their first month the pups remain in their den, and then, cautiously at first, emerge into the great outdoors.

Around the time they are leaving the safety of their den the pups are engaged in another important process – that of establishing a strict dominance hierarchy. The largest member of the litter, male or female, usually becomes the alpha pup. This position allows it to steal food from its litter mates. Each pup steals food from litter mates below it in the hierarchy. Should food become scarce, the dominant pups get a larger portion of the food and have the best chance of surviving while smaller and more submissive pups may die. By the time the pups are spending enough time outside the den to be noticed by humans, the hierarchy has been established, and we are witness to the less aggressive, playful, puppy-like behavior we associate with fox pups.

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Early Post for May 11th

Due to an itchy finger, tomorrow’s post has been emailed to you tonight!

Beaked Hazelnut Flowering

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Some of the most dazzling flowers this time of year are easily overlooked due to their diminutive size and the fact that they are not found on the ground. The flowers of Beaked Hazelnut (Corylus cornuta), a native shrub, are in this category. The shape and position of the male and female flowers illustrate their respective strategies for successfully producing seeds.

The female flower, located at the tip of the branch (where other branches don’t obstruct it) extends its tiny, star-like pistils into the air in several directions so that they easily collect pollen.

Down below the female flowers hangs the pendulous male catkin, dangling its pollen-laden stamens so that the wind can easily disperse the pollen. Because it is positioned below the female flower, there is a reduced likelihood of self-pollination.

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Bumblebees Active On Cool Mornings

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There is a reason why we often see bumblebees before we see honey bees in the early spring. It’s a matter of 5 degrees Fahrenheit. Bumblebees will fly when the air temperature is as low as 50°F. and sometimes lower. Honey bees cannot fly if it’s colder than 55°F.

Even though they can fly at 50°F., bumblebees cannot take off unless their flight muscles are above 86°F. and they must keep the temperature of their thorax between 86°F. and 104°F. In order to accomplish this, bumblebees uncouple their wing muscles so that the wings themselves do not move, and then use the muscles to shiver and raise their thorax temperature. (Photo: Tri-colored Bumblebee & Trailing Arbutus)

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Common Grackles Nest-building

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Common Grackles are hard to miss and hard to mistake for any other bird, with their yellow eyes, iridescent bronze or purple plumage and long, keel-shaped tails. Most of the spring migrants have reached their breeding grounds, and courtship, mating and nest-building are underway.

Because grackles begin reproduction so early in the season, conifers are the nesting site of choice due to the cover they provide. Females tend to choose the actual site for a nest, and in so doing can be quite fickle, often abandoning partially constructed nests and selecting alternative sites. They earn this right, as they’re usually doing all the construction work, although males have been observed with nesting materials, helping to build and repair nests.

Look for their 6-8”-diameter, large bulky nests near water, agricultural fields or near human habitation. They are usually built four to twenty feet above the ground. If you find a bird on the nest, it will most likely be an incubating female (slightly less glossy than male) – males not only do not have a brood patch and do not participate in incubating the eggs or brooding the young, but roughly half of the males desert their mates during this time. Those that do remain participate in the feeding of their young nestlings.

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Painted Turtles Basking

4-27-18 painted turtle2 0U1A1070When a Painted Turtle crawls out of the roughly 39° F. degree mud at the bottom of a pond in early spring, it immediately heads to the nearest log or rock to bask and raise its body temperature. Turtles are ectothermic (cold-blooded) and must rely on external sources for the regulation of their body temperature. Thermoregulation is achieved both physically and behaviorally. A dark carapace (top shell) absorbs the sun’s heat, warming up the turtle’s internal temperature and the turtle regulates its temperature by shuffling in and out of the sun. It is imperative for the core body temperature of male Painted Turtles to reach 63° F., for only then can they start to produce sperm.

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When a Painted Turtle crawls out of the 39° F. degree mud at the bottom of a pond in early spring, it immediately heads to the nearest log or rock to bask and raise its body temperature. Turtles are ectothermic (cold-blooded) and must rely on external sources for the regulation of their body temperature. Thermoregulation is achieved both physically and behaviorally. Dark carapaces (top shell) absorb the sun’s heat, warming up the turtle’s internal temperature. The turtle regulates its temperature by shuffling in and out of the sun. It is imperative for the core body temperature of male Painted Turtles to reach 63° F., for only then can they start to produce sperm.

Adult Butterflies Emerging, Mating & Laying Eggs

4-23-18 eastern comma3 0U1A0780Butterflies that remain in New England during the winter spend it in one of many stages – some as eggs, others as larvae or pupae, and a few as adults. Mourning Cloaks, Compton Tortoiseshells, Milbert’s Tortoiseshells, Question Marks, Gray Commas and Eastern Commas all overwinter as adult butterflies. They store fat in their bodies in the fall and replace a portion of the water in their blood with an antifreeze agent, which prevents the lethal formation of ice crystals in their bodies. These butterflies then slip into cracks, behind loose bark, in a hollow tree or some other sheltered spot where they enter a stage referred to as winter diapause. Metabolic and respiratory rates are greatly reduced, and the butterflies remain inactive until the warming, lengthening days of March and April, when they emerge to mate and lay eggs. They often look rather tattered, as they put many miles on their wings the previous summer. Unlike most adult butterflies which live only a few weeks, butterflies that overwinter as adults have a lifespan of eight to ten months. (Photo: Eastern Comma – note white “comma” on under side of hindwing)

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