The Various Amphibians
Newts, salamanders, frogs and toads are all amphibians. Such animals can be the specimen during dissection class of the students, which can be examined by means of microscopy using a microscope like the stereo dissecting microscope. These animals depend on external temperatures to keep their bodies sufficiently warm to continue living. The term amphibian means double-life since they can live in water and on land. Majority of amphibians lay eggs and covered only by jelly in the water. The young undergo a larval stage, taking breaths through gills and swimming with fins, prior to its transformation into adults. Even though majority of species have lungs, they also respire through their moist skin and the lining of their mouths, in which such parts can be better viewed by means of microscopy using a microscope such as stereo dissecting microscope. Amphibians do not ingest water instead they suck it up through their mucous-moistened skin.
Amphibians play a particular role in the health maintenance of the surroundings. Possibly because they inhabit on the edge between water and land, amphibians are extremely sensitive to pollution and other ecological variations. Globally, numerous species are deteriorating in numbers or have currently turned extinct.
There are amphibians that hibernate in winter. With the warmness of spring they appear and transfer to conventional breeding ponds. The males of the majority of the species of frogs call to invite mates in a lively chorus, while salamanders and toads that have no vocals look for their mates by smell. Mating and egg lying occur in the water, in which eggs and young are deserted to fend for themselves. The eggs grow quickly and hatch into larvae. Frog and toad larvae known as tadpoles are good swimmers and feed mostly on plants. Salamander larvae, which feed on insects, grow legs rapidly so that they can walk on the bottom of the pond. The tadpoles of certain species scavenge in schools and utilize chemicals to commune and caution of danger when injured. For several weeks the larvae develop into air-breathing, land-dwelling animals. Adult newts, frogs and toads are vigorous in the daylight and eat insects and other tiny creatures. Salamanders are active at night, hiding underneath the logs and leaf litter. The structures and skins of these amphibians are better observed by means of microscopy using a microscope such as stereo dissecting microscope. With the start of cold temperatures in late summer, amphibians draw back to their hibernating places.
Amphibians are cold-blooded and need to acquire their warmth from the surroundings. Their stay in the North has been restricted by incredibly cold winters, cool short summers, shortage of hibernation places and inadequate snow cover. Majority of the species of amphibians freeze to death while others have antifreeze in their cells to permit them to survive the extremely chilling temperatures. Wood Frogs and Boreal Chorus Frogs, for an instance, utilize glucose in their cells as antifreeze that precludes the cells from bursting in freezing temperatures. As a consequence, these frogs can be frozen solid during their hibernation period and still surface alive and well in spring. Northern amphibians take complete advantage of the warmness of the spring and summer. Eggs are huge and dark to aid in absorption of heat. They are plunged in warmer shallow water carefully below the surface that might freeze. Tadpoles like to laze around in the sun in the shallows while adult frogs and toads relax on land or in shallow water in the heat of the day. Certain amphibians that are nocturnal in warmer climates choose the warmest and brightest portion of the day in the North.
Wood Frogs live in forests, meadows, muskegs and even tundra. Their colors are highly variable such as tan, brown, or grey to pinkish, with a dark eye mask, white jaw stripe and creamy white base, which can be vividly seen through microscopy under the microscope like the stereo dissecting microscope. There may be a light stripe in the middle of its back. Adults can be as long as fifty millimeters. The Spotted Frog is more aquatic as compared to the Wood Frog. It may scavenge on land at day, but commonly stays close to the shore or even in the water where it sometimes feeds on underwater. Spotted frogs like to laze around in the sun. If threatened it will swim to the bottom of the pond and remain in the mud. It is muscular and much bigger than the Wood Frog, reaching one hundred millimeters in length. Little bumps and dark variable spots with light centers are spread on its olive, tan, light brown or dark brown skin, which can be further examined by means of microscopy using a microscope such as stereo dissecting microscope. It has a jaw strip that is light-colored. The base is creamy, coated with salmon or red close to the hind limbs, and spotted with grey elsewhere.
The Boreal Toad favors humid conditions but can be discovered in meadows or forests quite far from water or in brackish water on the coast. It is large having a maximum length of one hundred and twenty-five millimeters, and chunky, with short legs, lots of warts and dominant parotoid glands at the back of the head. The color of the back portion varies between green, brown and grey, and is coated with reddish warts enclosed by dark blotches. A grey pelvic patch in the groin portion has the ability to absorb water from the ground. These characteristics of Boreal Toad are better enhanced by means of microscopy using a microscope such as stereo dissecting microscope. Few predators other than snakes will consume adult toads due to its foul-tasting poison they emit from their parotoid glands and warts. The poison inflames the skin of some persons.
The Boreal Chorus Frog is small with a lengthened body and short legs. Its colors vary from grey, brown or green, with three uneven stripes down the rear and dark stripes on the sides, stretching from the nose to the groin. The belly can be white, yellow or olive with a few dark blotches. Such attributes are magnified under the microscope like the stereo dissecting microscope.
The Long-toed Salamander favors moist areas at forest margins, and goes into water merely to breed. It hibernates underneath rocks, rotten logs or leaf litter and surfaces during rainy periods. Its colors vary from dark grey, brown or black. It has a prominent green or yellow stripe down their back and white speckles on their sides. It is grey on its base and has a maximum length of one hundred and twenty millimeters. Such features are magnified under the microscope like the stereo dissecting microscope.
The Rough-skinned Newt has a rough, dark brown rear and a bright orange or yellow belly. Such characteristics are better observed under the microscope like the stereo dissecting microscope. It is found close to permanent ponds, involving brackish water or in open mixed coastal forests with lots of leaf litter and deadfall. Adults can also inhabit in water.
The Tailed Frog is typically olive, brown or grey, but can be pinkish or even black. Its color complements the rocks in its habitat. The male has a tail, or extended cloaca, utilized for breeding. Such attributes are better viewed under the microscope such as stereo dissecting microscope. Tailed Frogs scavenge for insects on land and in clear, cold coastal mountain streams.
