Field Journal 2

Date - 2/21/2020
Start time - 4:00 p.m.
End time - 5:30 p.m.
Location - Burlington Bay, Burlington, VT
Weather - 25 degrees Fahrenheit, sunny, low wind
Habitats - freshwater lake, city

I got to observe a probable ring-necked duck's flight for around thirty seconds. It took a bit to get off of the water, and it stayed within a few feet of the surface for its entire flight. Its wingbeats were fast and mechanical. The duck's wings were medium-length but very narrow and pointed.
I didn't get any pictures of the gull I observed, so it's not in my observations. Compared to the duck's flight, the gull's was more acrobatic, with slower wingbeats and a higher elevation. Its wings were also narrow, but considerably longer than the duck's.
We discussed the effects of wing-loading and aspect ratio on flying ability in class; the gull and duck provide good examples of how different species optimize their wing shape and size for their lifestyle. Ducks usually fly for short distances and spend most of their time in the water, so they can afford higher wing-loading, and while their high aspect ratio means they need more lift to get off the ground, they can still easily take off from the surface of the water. Gulls have lower wing-loading because they spend more of their time foraging, which means they need to be able to fly without expending much energy. They have longer wings to allow for dynamic soaring, but they still have a higher aspect ratio than, for example, a red-tailed hawk.
The fast, mechanical flapping of a duck's short wings are very characteristic of ducks, so even though I wasn't able to make out the markings on my "ring-necked duck", I could tell it wasn't a gull or a cormorant. The gull was even further away, but their wide wingspan, maneuverability, and combination of soaring and fast wingbeats are pretty distinctive.

Anotado por hilarygood hilarygood, febrero 22, lunes 21:59

Observaciones

Fotos / Sonidos

Qué

Mergo Mayor Mergus merganser

Autor

hilarygood

Fecha

Febrero 21, 2021 04:58 PM EST

Descripción

I’m not sure about the species for these ducks, because the setting sun behind them made it hard to see the colors.

Fotos / Sonidos

Square

Qué

Paloma Asiática Doméstica Columba livia

Autor

hilarygood

Fecha

Febrero 21, 2021 05:21 PM EST

Descripción

I saw three rock pigeons on the top of the Echo Center, but by the time I got my phone out, only one was left.

Fotos / Sonidos

Qué

Pato Pico Anillado Aythya collaris

Autor

hilarygood

Fecha

Febrero 21, 2021 05:06 PM EST

Descripción

I think this may have been a ring-necked duck. I saw one close up, and then the one duck flew out further into the lake to join a group of around seven other ducks.

Birds

Fotos / Sonidos

Square

Qué

Aves Clase Aves

Autor

hilarygood

Fecha

Febrero 22, 2021 04:59 PM EST

Descripción

The sun was setting behind the duck I observed for this field sketch, so it was really difficult to tell how much of it was really black and how much of the black was just because the duck was in silhouette. I think I saw yellow-orange on the legs, but it could have been the setting sun reflecting on the ice.

Comentarios

No hay comentarios aún.

Añade un comentario

Entra o Regístrate para añadir comentarios