DUCKS Fascinating facts a Resource pack by Christine Sladden and Peter Worrall Registered charity No.263156 www.waterfowl.org.uk Tel. 01531 671250 THE MALLARD - FACT SHEET It is the commonest and most widely distributed duck, often called the wild duck. HABITAT It lives in a wide variety of freshwater and marine sites, including coastal bays, estuaries, lakes, rivers, gravel pits, reservoirs, ponds, ditches and even city parks. DESCRIPTION One of the largest British duck found in the wild, it is around 57 cm long. During the winter the drake is easy to spot, with his bright green head, white neck ring, rusty breast and grey body. He has a yellow bill. The female can be identified by her bright blue speculum bordered with white. Her beak is a greenish yellow. Both sexes have orange legs and feet. Juveniles resemble the female apart from the bill colour which is reddish-brown. After the breeding season, in midsummer and early autumn the drake is in eclipse. That means he loses his bright colours and looks much like the duck except that he keeps his yellow bill. VOICE Duck - a loud "quack", drake a softer higher-pitched "queek". FOOD Like most humans, the mallard is omnivorous. This means that it eats both plants and animals. Its feeding is as varied as its diet. It upends for waterweed and small water creatures and also dabbles for these. It grubs for invertebrates (e.g. slugs and worms) and for rotten potatoes and often flies inland at night to graze on meadows and young corn. BREEDING The birds pair up following courtship displays by the males, which include rapid swimming, head flicking and bill dipping. Nests are well hidden, lined with grass, quite often in reeds or other vegetation close to the water. Usually 10 - 12 eggs are laid. Incubation takes 27 - 28 days. The ducklings are covered with down when they hatch and can walk and feed within 24 hours. The female broods them at night. They fly and become independent at about 8 weeks. MOVEMENT Mallards are strong fliers and take off almost vertically. They have a fast - beating flight action and can be heard at quite a distance. 1 HOW DO DUCKS SWIM? 1. WHY DO THEY NOT SINK? In proportion to their size all birds are very light. This enables them to fly and swim. For birds, ducks are heavy, but like all other birds they have light hollow bones which are full of air. If you have a chance to compare chicken bones with those of a mammal you will see how light and strong they are. Their weight is also spread over a large area . If you have ever done any work on floating and sinking you will probably have done an experiment with plasticine. EXPERIMENT A EXPERIMENT B A ball of plasticine sinks to the In experiment B you can see the effect air bottom. Using the same size ball has on floating and sinking. The loosely of plasticine and making it into a crumpled foil ball contains air, so it floats. If boat you should succeed in you can crumple it tightly enough to getting it to float exclude most of the air- it sinks Experiment B also shows you something which helps ducks to float. As well as air passing into their bones and in their lungs they can also trap air under their feathers. 2. WHY DO THEIR FEATHERS NOT GET WET? If you have ever seen a chicken in the rain you know what “you look like a wet hen " means. Ducks do not get miserably wet like this as they have an oil gland near the tail with which they oil their feathers. If you watch you will see them getting the oil on their beaks and preening their feathers with it. Here is an experiment to show the effect of the oil. You need a paper towel, a small amount of cooking oil and a few drops of water. Make a small patch of oil on your paper towel. Put a drop of water on the oiled patch and another drop on an unoiled patch. Watch for a few seconds to see what happens. Does this help you to see why ducks' feathers do not get waterlogged? 2 MOVING THROUGH THE WATER BODY SHAPE Look at the shapes of the ducks shown here. Quite a lot of the Mallard's body is under the water. Ducks are clumsy on land, but they are well adapted for swimming. What do you think it is about their bodies which helps them to glide through the water ? Are there any sharp angles on the body of a duck, or is it made up of smooth curves? Which boat shape do you think would move most easil y through the water? If you have toy boats or can make some, it is interesting to see which shape is most streamlined. You do need a large water tray or better still a swimming pool to do this experiment properly. FEET Have you ever used flippers to help you swim? If you have, you will have some idea of how webbed feet push a duck through the water. The action of the feet and legs is rather like walking, although sometimes both legs are used together. As the leg comes forward, the foot is folded so it passes through the water easily. To turn, the duck paddles more strongly one side as you do if you go rowing. Watch ducks swimming and you will see how quickly they can maneuver in the water. DIVING The ducks shown above in silhouette merely upend. To the left you can see a duck which actually dives. Compare the shape with the ducks above and see why you think it is better adapted for diving 3 FROM EGG TO DUCKLING WHY DO BIRDS LAY EGGS ? Most birds fly, all birds lay eggs. Mammals give birth to their young live. Why do you think birds lay eggs rather than give birth to live young? CLUE - flight. THE NEST It is the female duck who builds the nest. Once a place for the nest is chosen she builds it by collecting any material which is close at hand. Ducks do not travel far from the nest to collect material (would you say this is true of most birds or not?) Once built the nest is lined with DOWN - small feathers which the female duck plucks from her belly. This not only provides a warm lining to the nest, but leaves a bare patch on her belly. This is known as a brood patch . Why do you think this brood patch is important for incubating the eggs? Incubating means to keep the eggs warm, so they will grow and develop into ducklings. THE EGGS Once the nest has been built, the duck lays one or two eggs each day until she has a complete clutch . This can be anything from 5 - 15 eggs. The female waits until she has completed her clutch before she starts to incubate her eggs. Why do you think she waits until the clutch is complete before starting to incubate the eggs? HATCHING A few days before the eggs are due to hatch the ducklings begin to pip and the mother duck calls back to them. Using the egg tooth and a great deal of pushing and stretching the duckling forces its way out of the egg shell. It can have been growing and developing for anything between 25 and 35 days and will be damp and slimy. It quickly dries out under its mother's feathers and within hours of hatching has a coat of fluffy down and is ready to meet the world. 4 DAY 1 The spherical yolk floats in the fluid albumen (the white of the egg). The early embryo develops as a spot at the top, nearest the heat from the incubating adult. DAY 3 The tiny heart, with main blood vessels already formed, is actively beating only three days after the egg is laid and before the duckling is recognizable. DAY 9 Oxygen which has passed through the pores of the shell and nutrients from the yolk are fed to the developing duckling through a fine hair-like mass of blood vessels. DAY 15 The yolk reduces in size as the duckling takes on a recognizable form. The eye is the dominant feature but other details especially the bill and feet are visible. DAY 20 the largest feature of the fully developed duckling is the foot. On DAY 27 (for the Mallard) the duckling cracks the eggshell with a tiny egg tooth and emerges into the world. Ducklings, goslings and cygnets are known as PRECOCIOUS. This means that when they hatch they are covered with down and can walk, swim and feed. Many other birds, such as thrushes and sparrows, hatch naked, often blind and need to be fed by their parents. 5 DOMESTIC, ORNAMENTAL AND WILD DUCKS (Background information) Wild ducks are any ducks living in their natural habitat or countries of origin. Ornamental ducks are wild ducks from all over the world kept by people as a hobby. Mandarin ducks, which have gone wild in England, are also classed as ornamental as they originate from E.Asia. Mandarins are now classed as a British species. There are more mandarins in the UK now than in their native China. Domestic ducks. It is thought that all domestic ducks except the Muscovy are descended from the Mallard. The French Rouen duck is exactly like the Mallard in colour but much bigger.