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Reptiles, Amphibians, Invertebrates & Small Pets : Wood Frog Facts

Reptiles, Amphibians, Invertebrates & Small Pets : Wood Frog Facts


Here we have a wood frog, we have two wood
frogs. Their scientific name is lithobates sylvaticus. They have a broad North American
distribution, extending from the southern Appalachians to the arctic tree line. This
particular species is very interesting, as it’s found further north than any other North
American reptile or amphibian. They are the only frogs that are found north of the Arctic
Circle. This frog is very common in woodlands across the range. They are most common in
the summer under stones, stumps, and leaf litter. This frog can reach lengths of two
and a half inches to three inches. And the females are generally a lot larger than the
males. You can see that they are often brown, tan or rust colored, and the underparts of
this frog are often yellowish and their legs are generally green. They are characterized
by a black line along the side of their eyes, and that extends to the back of their head.
These wood frogs are seasonal breeders, and they begin very early in spring. They are
often the first frogs to begin calling at the ponds, even before the ice is completely
melted. The females can lay large globular egg masses in the deepest part of the ponds,
of about one thousand to three thousand eggs. The jelly around the eggs become camouflaged
in this green color which is actually produced by algae in the pond. The tadpoles of this
species undergo a complete metamorphosis in about two months and they can reach sexual
maturity in approximately two years. The wood frog tadpoles are very cool ’cause they actually
have been shown to have the strongest powers of kin recognition within amphibian larvae.
They’ve been documented by marking them with dye and releasing them into natural habitats,
and it’s been shown that they are able to aggregate back together with the larvae from
their egg mass, and it’s believed that they do this because it allows them the potential
benefits of food, thermoregulation, and defense against other predators. These wood frogs
are insectivores. They like to eat slugs, snails, and various insects they find on the
forest floor. The wood frog is actually very interesting, as they are resistant to freezing
during the winter time. This particular species of frog can convert, uses its liver glycogen
and it converts it into large quantities of glucose in response to ice formation in their
tissues. The glucose that they make acts as an antifreeze inhibiting ice formation and
the rupturing of their cells. If the ice formation is confined to extracellular fluids, then
they can survive the winter.

Comments (6)

  1. Lots of mistakes in this video:
    1) There are other frogs found north of arctic circle (e.g., Rana temporaria).
    2) Their legs are almost never green.
    3) the number of eggs produced by each female is about 400 – 1,000;NOT 1,000 to 3,000.
    4) Some species of spadefoot toads have stronger kin recognition abilities.

  2. Lots of mistakes in all her video's, she got some facts right, but she can't handle any of the animals!

  3. There not the coolest I see loads alot I live on Canada manatoba

  4. Very informative and scientifically accurate!

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