Science Source December 28, 2009 DVD

Illustration of the tadpole of the green frog (Rana clamitans).

Illustration of the green frog (Rana clamitans).

Illustration of the grey catbird (Dumetella carolinensis).

Illustration of the internal anatomy of the heart.

Illustration of the component layers of heart tissue.

Illustration of an iceberg.

Illustration of the male indigo bunting (Passerina cyanea), the female is brown.

Interior anatomy of a pig heart.

Diagram showing the left ventricle of the heart.

Illustration of a leopard frog (Rana).

Illustration of a male cardinal (Cardinalis cardinalis). The female is less brilliantly colored.

Illustration of the moon.

Illustration of a mudpuppy, an aquatic salamander of the family Proteidae.

Illustration of a Murrelet, a small, chunky bird in the genus Brachyramphus.

Illustration of neap tide, the points in the lunar cycle when the ocean's tidal range is at the minimum.

Illustration of a newt, a salamander that lives in the water as an adult.

Northern milfoil.

Illustration of the pickerel frog (Rana palustris), a small North American frog characterized by distinctive rectangular spots on the back.

Illustration of a nuthatch, a bird in the genus Sitta characterised by a large head, short tail, and powerful bill and feet.

Illustration of the ovenbird (Seiurus aurocapillus), a small songbird of the New World warbler family.

Anatomy of a yellow perch (Perca flavescens).

Exterior anatomy of a pig heart (anterior view)

Illustration of a pond ecosystem.

Illustration of purple loosestrife (Lythrum salicaria).

Illustration of a red backed salamander (Plethodon cinereus), a small, hardy woodland salamander.

Illustration of the California red-legged frog (Rana draytonii), a moderate to large species of frog native to California.

Illustration showing the relative sizes of various species of frogs, salamanders and newts.

Illustration of a rose-breasted grosbeak (Pheucticus ludovicianus).

Illustration of a ruffled grouse (Bonasa umbellus).

Illustration of a ruffled grouse (Bonasa umbellus).

Illustration of the tidal effect from the moon's gravitational pull.

Illustration of the common snapping turtle (Chelydra serpentina), a large freshwater turtle of North and Central America.

Illustration of the spotted salamander (Ambystoma maculatum), a common mole salamander of eastern North America.

Illustration of the spring peeper (Pseudacris crucifer), a small chorus frog widespread throughout eastern North America.

Illustration of spring tide, the points in the lunar cycle when the ocean's tidal range is at the maximum.

Illustration of the sun.

Illustration of a white tern (genus Sterna).

Illustration of tidal forces on the earth.

Illustration of tiger salamander (Ambystoma tigrinum) larva.

Illustration of a tiger salamander (Ambystoma tigrinum).

Diagram of a volcano.

Illustration of a water scorpion, an aquatic insect with front legs similar in appearance to a scorpion's front claws.

Illustration of a painted turtle (Chrysemys picta), a common turtle of the United States.

Illustration of wild calla (Calla palustris), a flowering plant native to cool temperate regions of the Northern Hemisphere, growing in bogs and ponds...

Labelled illustration of the wild iris (Dietes iridioides).

Illustration of the wild iris (Dietes iridioides).

Illustration of the wood frog (Rana sylvatica), whose range extends from the southern Appalachians to the boreal forest.

Illustration of the yellow-rumped warbler (Dendroica coronata).

Illustration of the yellow warbler (Dendroica petechia), the most widespread Dendroica species, breeding throughout the Americas.

A coprolite is the fossilized feces of a prehistoric animal. As it is very rare that a sample can be accurately related to a specific genus of animal,...