What is ruff and REE?

What is the root word of Ruff?

[Middle English rowe, roffe, ruffe, any of various fishes, especially Gymnocephalus cernuus, perhaps from variant of rough, rough; see rough, or from Medieval Latin rufus, a kind of fish (perhaps from Latin rūfus, red, tawny; see rufous).] ruff 4. n. See ruffle2.

What kind of bird has two white bars on its tail?

Brown wings have two white bars. Tail is white-edged. Bill is black. Legs and feet are pink. Eats mostly insects, also eat seeds. Smew: Small merganser, mostly white body except for black back, mask, breast bar, and V-shaped nape patch.

What kind of bird has a yellow bill and red feet?

Bill is bright yellow; legs and feet are orange. Red-billed Tropicbird: This slender, white, gull-like seabird is the largest tropic bird. It has long white tail streamers, a white back that is finely barred in black, a black eye stripe curves that upward behind the eye, black primaries, and a red bill.

Why do female finches visit the lek?

Females visit the lek briefly to select mates and to copulate, but they do not form lasting pair bonds with the males. This article was most recently revised and updated by Amy Tikkanen.

Why are there only one male finches at the feeder?

If you are seeing a single male at your feeders, this is the reason why. With natural food sources becoming abundant this time of year, these fresh resources are used by the finches in addition to quick stops at the feeder. Time to Hatch!

What is the interaction between males and females in the lek?

Varying degrees of interaction occur between the males, from virtually none to closely cooperative dancing. Females visit the lek briefly to select mates and to copulate, but they do not form lasting pair bonds with the males.

Are finches loud birds?

Finches may not be particularly loud, but they still vocalize often. Many owners find these noises soothing, and the low volume makes these birds apartment friendly. Those wanting quiet birds may want to reconsider, as finches do tend to chirp and sing throughout the day.

What is an example of intrasexual selection in animals?

Intrasexual selection tends to lead to weaponry, armor, fighting ability, and threat displays. Examples include large body size in iguanas, infanticide in lions, and antlers in deer. Note that some traits may serve both functions.

What conditions will sexual selection produce different traits in the two sexes?

Under what conditions will sexual selection produce different traits in the two sexes (i.e., sexual dimorphism)? Why is one sex often “choosy” while the other is “showy”? The fundamental cause of sexual dimorphism is an asymmetry in the amount of parental investment in a given mating and the care of any resulting offspring.

What is an example of sexual selection in birds?

This form of sexual selection tends to lead to “display” or “advertisement” traits, such as showy or colorful body parts, or exaggerated mating displays. Examples include long tails in male red-collared widowbirds, calling in male frogs, and eye-stalk length in stalk-eyed flies.

When the males and females have the same general habits?

When the males and females…have the same general habits but differ in structure, colour, or ornament, such differences have been mainly caused by sexual selection. Darwin, The Origin Of Species

Are finches good apartment birds?

Many owners find these noises soothing, and the low volume makes these birds apartment friendly. Those wanting quiet birds may want to reconsider, as finches do tend to chirp and sing throughout the day. Males in particular love to sing.

What is the difference between sexual selection and natural selection?

But just as with natural selection individuals may differ in their ability to reproduce, in sexual selection there can be differential reproductive success among individuals of the same sex (and species). In order to mate, males need to gain access to females and vice versa, and not all individuals will be equally successful at this task.

What is intersexual selection in biology?

Intersexual selection refers to sexual selection for increased attractiveness to members of the opposite sex. This form of sexual selection tends to lead to “display” or “advertisement” traits, such as showy or colorful body parts, or exaggerated mating displays.

Do secondary sexual traits pose a challenge to natural selection?

These secondary sexual characters (Hunter, 1837) are not directly required for reproduction, unlike primary sexual traits, and pose a challenge to natural selection, as they advertise rather than conceal and are likely to compromise survival.

When males are subject to stronger sexual selection than females?

(A) When males are subject to stronger sexual selection than females, males will evolve secondary sexual characters that result in marked differences between the sexes. Peacocks do not provide any parental care, and some males are more successful than others who may never reproduce, leading to marked dimorphism.

How does intersexual selection differ from natural selection?

Intersexual selection is the preferential choice of mates by one sex relative to the other sex. • Sexual selection enhances mating success or the number of copulations, while natural selection tends to produce well-adapted individuals to their environment. Sexual selection does not adapt the individuals to their environment.

What are the two mechanisms of sexual selection in humans?

He recognized two mechanisms of sexual selection: intrasexual selection, or competition between members of the same sex (usually males) for access to mates, and intersexual selection, where members of one sex (usually females) choose members of the opposite sex.

What are the two types of sexual selection in humans?

There are two types of sexual selection, intersexual and intrasexual. In intersexual selection, one sex, typically the males, will display a certain trait or behavior with the goal of attracting and mating with the opposite sex. Intrasexual selection, on the other hand, occurs between members of the same sex.

What is intersexual selection?

What is Intersexual Selection? Intersexual selection is the sexual selection that occurs between two sexes. In other words, the intersexual selection is the sexual selection that occurs when the members of one sex (usually females) choose members of the opposite sex. Therefore, the intersexual selection is a result of interactions between males

Is sexual selection a subcategory of natural selection?

Sexual selection is not a subcategory of natural selection, as Darwin made very clear: it arises from differences in mating success, whereas natural selection is due to variance in all other fitness components. This simple delineation comes closest to Darwin’s concepts and distinctions.

What is the difference between natural and artificial selection?

Natural selection is controlled by nature; the artificial selection is controlled and coordinated by humans only. Natural selection is performed on all the types organisms; Artificial selection is processed on some selective organisms of humans desires. In the natural selection,…

What are the types of selection in biology?

There are several types of selections such as natural selection, sexual selection, artificial selection etc. Selection of organisms is defined as some sort of functional relationship between fitness and phenotype. Selection is the basic concept which helped Charles Darwin to introduce his theory of evolution.