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  • Brood Parasitism - when members of the same species surreptitiously place their own eggs in another’s nest so that the parenting costs are placed on the host. Evidence for this would include above average clutch sizes and parasite visitations to find and use host nests, which is known as “hole-nesting” (Evarts 1987).
  • Cloaca - the opening through which birds pass their excrement; also used directly by both sexes in most bird species to mate
  • Clutch - group of eggs that a hen lays from one season
  • constraints theory - “says that when individuals reproduce with nonpreferred partners, they will have offspring of lower viability than when individuals reproduce with preferred partners” (Bluhm and Gowaty 2004).
  • Drake - male duck
  • Eversion - the process of being turned outward as with the finger of a glove when the hand is removed
  • Forced copulation - an act of mating in which one member of the party is unwilling; this may be between pair-bonded individuals and not just extra-pair
  • Good Genes Hypothesis - choosing mates under sexual selection, in this case for the indirect benefits that they provide, namely genes
  • Hen - female duck
  • Intromittent organ - an external organ, usually of males used to deliver sperm. Can be seen in females, where it is used to receive sperm.
  • Mate-choice hypothesis for indirect benefits - see good genes hypothesis
  • Phylogenetic Evidence - evidence derived from assumptions about the ancestry of an organism. Based on data drawn from various sources including the fossil record and genetic analysis.
  • Reproductive success - the relative production of fertile offspring by an individual.
  • Seasonal pair-bond - a mutualistic bond between two mates, in which both stay near to each other for increased safety and reproductive success. Usually lasting in mallards until the end of the breeding season or when the female lays her clutch.
  • Sexual conflict - is the result of differing evolutionary interests between the sexes of a species. This conflict is usually due to competition for greater reproductive success amongst members of the same sex but which often involves tactics that reduce the other sex’s overall reproductive success.


  • Abraham R. 1974. Vocalizations of the Mallard (Anas platyrhynchos). The Condor. 76(4): 401-420.
  • Interesting but difficult to read instead of hear
  • Adler M. 2010. Sexual conflict in waterfowl: why do females resist extra-pair copulations? Behavioral Ecology. 21(1): 182-192.
  • Synthesizes a lot of information about forced copulation and makes hypothesis about resistance
  • Arnqvist G. 1998. Comparative Evidence for the Evolution of Genitalia by Sexual Selection. Nature 393: 784-786.
  • Birkhead TR, Atkin L and Møller 1987. AP. Copulation Behaviour of Birds. Behaviour. 101: 101-138.
  • Birkhead TR, Cunningham EJA and Cheng KM. 1996. The Insemination Window Provides a Distorted View of Sperm Competition in Birds. Proceedings: Biological Sciences. 263(1374): 1187-1192.
  • Bluhm CK and Gowaty PA. 2004. Social constraints on female mate preferences in mallards, Anas platyrhynchos , decrease offspring viability and mother productivity. Animal Behaviour. 68(5): 977-983.
  • Bluhm makes the case for good genes hypothesis with a simple experiment
  • Brennan PLR, Prum RO, McCracken KG, Sorenson MD, Wilson RE, Birkhead TR, et al. 2007. Coevolution of Male and Female Genital Morphology in Waterfowl. Coevolution of Male and Female Genital Morphology in Waterfowl. PLoS ONE 2(5): e418. doi:10.1371/journal.pone.0000418.
  • This is really my go to source on the sexual conflict between mallards seen in their evolution
  • Briskie J and Montgomerie R. 1997. Sexual Selection and the Intromittent Organ of Birds. Journal of Avian Biology. 28(1): 73-86.
  • Burns JT, Kimberly CM and McKinney F. 1980. Forced Copulation in Captive Mallards. I. Fertilization of Eggs. The Auk. 97(4): 875-879.
  • Cunningham EJA. 2003 Female mate preferences and subsequent resistance to copulation in the mallard. Journal of Behavioral Ecology. 14(3): 326-333.
  • Davis ES. 2002. Female choice and the benefits of mate guarding by male mallards. Animal Behaviour. 64(4): 619-628.
  • Davis ES. 2002. Male reproductive tactics in the mallard, Anas platyrhynchos: social and hormonal mechanisms. Behavioral Ecology and Sociobiology. 52(3): 224-231.
  • Explains a lot of the testosterone basis of forced copulation
  • Denk AG, Holzmann A, Peters A, Vermeirssen E and Kempenaers B. 2005. Paternity in mallards: effects of sperm quality and female sperm selection for inbreeding avoidance. Behavioral Ecology. 16(5):825-833.
  • Evarts S and Williams CJ. 1987. Multiple Paternity in a Wild Population of Mallards. The Auk. 104(4): 597-602.
  • Goodburn SF. 1984. Mate Guarding in the Mallard Anas platyrhynchos. Ornis Scandinavica. 15(4): 261-265.
  • Goode A. Mallard Duck. Northwest Wildlife Preservation Society. (External Link) .
  • Gowaty P and Buschhaus N. 1998. Ultimate Causation of Aggressive and Forced Copulation in Birds: Female Resistance, the CODE Hypothesis, and Social Monogamy. American Zoologist. 38(1):207-225.
  • Griffith SC, Owens I and Thuman K. 2002. Extra pair paternity in birds: a review of interspecific variation and adaptive function. Molecular Ecology. 11: 2195-2212.
  • Hosken D and Stockley P. 2004 Sexual selection and genital evolution. Trends in Ecology&Evolution. 19(2): 87-93.
  • Johnsgard P. 1960. A Quantitative Study of Sexual Behavior of Mallards and Black Ducks. The Wilson Bulletin. 72(2): 133-155.
  • Johnson O. 1961. Reproductive Cycle of the Mallard Duck. The Condor. 63(5) 351-364.
  • Gives important background about how the sex works and development of the organs
  • Losito M and Baldassarre. 1996. G. Pair-Bond Dissolution in Mallards. The Auk. 113(3): 692-695.
  • McCracken KG, Wilson RE, McCracken PJ and Johnson K. 2001. Sexual Selection: Are Ducks Impressed by Drakes’ display? Nature 413(6852): 128.
  • McCracken, K. 2000. The 20-cm Spiny Penis of the Argentine Lake Duck (Oxyura vittata). The Auk, 117(3): 820-825.
  • McKinney F and Evarts S. 1998. Sexual Coercion in Waterfowl and Other Birds . Ornithological Monographs. 49: 163-195.
  • McKinney seems to know his stuff on waterfowl sex. He did most of the original studies on them
  • McKinney F, Derrickson SR and Mineau P. 1983. Forced Copulation in Waterfowl. Behaviour . 86(3): 250-294.
  • Moeliker CW. 2001. The first case of homosexual necrophilia in the mallard Anas platyrhynchos (Aves: Anatidae). Deinsea. 8: 243-248.
  • Omland, Kevin. 1996. Female mallard mating preferences for multiple male ornaments. Behavioral Ecology and Sociobiology. 39: 353-360.
  • Palmer CT. 1989. Rape in Nonhuman Animal Species: Definitions, Evidence, and Implications. The Journal of Sex research. 26(3):355-374.
  • Peters A, Denk AG, Delhey K and Kempenaers B. 2004. Carotenoid-based bill colour as an indicator of immunocompetence and sperm performance in male mallards. Journal of Evolutionary Biology. 17(5):1111-1119.
  • Westneat D and Stewart I. EXTRA-PAIR PATERNITY IN BIRDS: Causes, Correlates, and Conflict . Annual Reviews. 34: 365-396.

About the author

Picture of Allen Gu, the author.

Allen Gu<Goo>is a mentally stable, self-preserving genetic automaton. Born in Birmingham, Alabama, he would go on to spend the majority of his life in Louisiana eating crawfish and frying under the sun. After much preteen angst over his weak kung-fu, he chose to attend Rice University where he would attend BIOS 321. After reading the Selfish Gene, he came to realize that everything he had ever done and all the cells of his entire body were being controlled by inanimate objects that are too small to see with the naked-eye. These inanimate objects, he learned were in turn made in the chaotic hell zones of prehistoric Earth completely at random as were all living things. Driven mad by the dark knowledge he had attained of the world and his own existence, he would start on his path to being a pre-med!!!

Questions & Answers

find the 15th term of the geometric sequince whose first is 18 and last term of 387
Jerwin Reply
The given of f(x=x-2. then what is the value of this f(3) 5f(x+1)
virgelyn Reply
hmm well what is the answer
how do they get the third part x = (32)5/4
kinnecy Reply
can someone help me with some logarithmic and exponential equations.
Jeffrey Reply
sure. what is your question?
okay, so you have 6 raised to the power of 2. what is that part of your answer
I don't understand what the A with approx sign and the boxed x mean
it think it's written 20/(X-6)^2 so it's 20 divided by X-6 squared
I'm not sure why it wrote it the other way
I got X =-6
ok. so take the square root of both sides, now you have plus or minus the square root of 20= x-6
oops. ignore that.
so you not have an equal sign anywhere in the original equation?
is it a question of log
Commplementary angles
Idrissa Reply
im all ears I need to learn
right! what he said ⤴⤴⤴
what is a good calculator for all algebra; would a Casio fx 260 work with all algebra equations? please name the cheapest, thanks.
Kevin Reply
a perfect square v²+2v+_
Dearan Reply
kkk nice
Abdirahman Reply
algebra 2 Inequalities:If equation 2 = 0 it is an open set?
Kim Reply
or infinite solutions?
The answer is neither. The function, 2 = 0 cannot exist. Hence, the function is undefined.
Embra Reply
if |A| not equal to 0 and order of A is n prove that adj (adj A = |A|
Nancy Reply
rolling four fair dice and getting an even number an all four dice
ramon Reply
Kristine 2*2*2=8
Bridget Reply
Differences Between Laspeyres and Paasche Indices
Emedobi Reply
No. 7x -4y is simplified from 4x + (3y + 3x) -7y
Mary Reply
how do you translate this in Algebraic Expressions
linda Reply
Need to simplify the expresin. 3/7 (x+y)-1/7 (x-1)=
Crystal Reply
. After 3 months on a diet, Lisa had lost 12% of her original weight. She lost 21 pounds. What was Lisa's original weight?
Chris Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
what is system testing
what is the application of nanotechnology?
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
anybody can imagine what will be happen after 100 years from now in nano tech world
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
can nanotechnology change the direction of the face of the world
Prasenjit Reply
At high concentrations (>0.01 M), the relation between absorptivity coefficient and absorbance is no longer linear. This is due to the electrostatic interactions between the quantum dots in close proximity. If the concentration of the solution is high, another effect that is seen is the scattering of light from the large number of quantum dots. This assumption only works at low concentrations of the analyte. Presence of stray light.
Ali Reply
the Beer law works very well for dilute solutions but fails for very high concentrations. why?
bamidele Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Mockingbird tales: readings in animal behavior. OpenStax CNX. Jan 12, 2011 Download for free at http://cnx.org/content/col11211/1.5
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