Ann Haven Morgan

“{{wikipedia-inline}}”

“Morgan's views concerning animal and human interdependence place her among a select group of strong conservationists, of whom the most renowned is probably Rachel Carson ...”

“... Although she carried on most of her research in the northeastern United States, she spent the summer of 1926 working in {{w|British Guiana}} at the Tropical Laboratory in Kartabo.Although limnology was her special subject—on which wrote a useful book, Field Book of Ponds and Streams (1930)—Morgan was also interested in many other facets of zoology, particularly hibernating animals. Her Field Book of Animals in Winter (1939) reflected this interest. In 1949 the {{w|Encyclopædia Britannica}} made it into an educational film. She was also interested in conservation and ecology..”

“... {{w|Oyster}}s feed upon microorganism from the muck and water of the bottom and in turn are consumed by {{w|starfish}}es, {{w|oyster borer}}s and mankind.”

“Feeding. The majority of {{w|turbellaria}}ns are carnivorous. The smaller fresh-water ones feed upon {{w|crustacean}}s and worms that are nearly microscopic, the larger one on {{w|snail}}s, {{w|earthworm}}s and {{w|Insect#Reproduction and development|insect larvae}}, often on their softened remains. Even in quiet waters they can detect juicy meat two or three feet away.”

“{{small caps|Turbellaria—Planarians and Others}}. The power to regrow lost parts permits {{w|planaria}} to survive and even to multiply after injury. Three planarians may live and flourish because one was cut into three pieces. All {{w|turbellaria}}ns are aquatic. A considerable number live in fresh water and a few on moist soil. Most of them are marine.”

“The {{w|kidney}}s ({{w|nephridia}}) of {{w|earthworm}}s repeat the essentials of kidney form and function, tubules closely associated with blood and body fluid, each one a guardian of the content of the blood. There are two kidneys in nearly every segment of the earthworm ...”

“… Wherever animals live, in fresh water, salt water, or on land, their body fluids are similar; all are salty. In marine invertebrates, whether {{w|jellyfish}}es or {{w|horseshoe crab}}s, the body fluids are practically filtered sea water.”

“Crickets.—Crickets, like grasshoppers, vary in their winter habits. Some live over the winter in the {{w|Cricket (insect)#Reproduction and lifecycle|egg stage}}; others hibernate as {{w|Nymph (biology)|nymph}}s. Nymphs of the {{w|Gryllus|field cricket}}, Gryllus assimilis pennsylvanicus (which has a short {{w|ovipositor}}), hibernate beneath stones ...”

“In most cold winters there is plenty of snow, and this is the greatest aid to wintering insects.”

“As the spawning season approaches, fishes move toward the shores of ponds and lakes or upstream in the creeks. Some of them, such as perch and sunfish, only swim in among nearby weeds or protecting stones. The journeys vary from such short ones to the famous migrations of river salmon, extending over hundreds of miles; but they all end at spawning grounds or nesting sites. During this time color differences between male and female appear or become more marked.”

“{{w|Rotifer}}s are transparent microscopic animals which live in fresh or salt water. They abound in the surface waters of great lakes, and swarm through the shallows of ponds and bogs; there is scarcely any stand of soft water, whether transient puddle or rain-barrel or fountain-basin, where rotifers can not be found. They live in ponds and lakes, providing a large part of the food for small {{w|crustacean}}s and worms and are thus indirectly a large source of food for fishes.”