Hyla Versicolor, the Grey Tree Frog

The June woods are alive at night with the call of Hyla versicolor, Grey Tree Frogs.  They breed from April to August, with males gathering in trees near water and calling to the females.

The female selects a mate based on its call. She will lay her eggs in any available standing water: ponds, vernal pools, even old tires or swimming pools. The tadpoles hatch in four or five days and will change into froglets in about two months.

As their Latin name suggests, Hyla versicolor has the ability to change color, appearing green, gray, or brown.  It can be a solid color or can have blotches on its back and can change its color in seconds. It tends to appear darker when it is cold or dark.  Its coloring helps it blend in with tree bark.

When the mating season comes to a close, the Grey Tree Frogs return to the woodlands and edge habitats for a mostly solitary existence; eventually hibernating under leaves on the ground through the cold months and withstanding freezing temperatures by producing glucose as an anti-freeze. 

A June Nature Ramble

Here on our Virginia Blue Ridge Mountain farm we are still having some cool nights in the 50's, but many days are sunny and warm and nature is in full growth and reproduction mode.

I enjoy re-acquainting myself with the resident odonates (dragonflies and damselflies) and lepidopterans (butterflies).  One of my favorite damselflies is the ebony jewelwing in which the male has black wings and a spectacular iridescent blue/green body, the color depending on the angle of the sunlight.  When I was growing up in Georgia, these were called "snake doctors" since they sometimes landed on basking water snakes.  The remarkable metamorphosis of dragonflies, from aquatic nymph to flying adult, is not fully appreciated until you observe the process as seen in the photo below.  All dragonflies are highly carnivorous, but the impressive dragonhunter actually feeds on other dragonflies and must appear as a miniature T rex to its prey. 

Dragonfly metamorphosis from aquatic nymph to flying adult

Ebony jewelwing damselfly male

Dragonhunter

Butterflies are appearing in our fields in increasing numbers and this male black swallowtail was attracted to a patch of white clover along a trail.  When grass is mowed repeatedly in our hay fields, the result is often a dense patch of white clover which is beneficial to butterflies.  The black swallowtail is one of the confusing "black and blue" butterflies which appear to mimic the toxic  pipevine swallowtail.  The "tails" are likely to be a head mimicry trick to appear to be antennae and divert the strike of predators away from the real head.  Great spangled fritillary butterflies are out in numbers and are strongly attracted to the first common milkweeds to bloom, as well as to orange butterfly milkweeds. 

Black swallowtail male butterfly on clover

Great spangled fritillary on common milkweed flower

Spring is of course a time of considerable amphibian breeding, but it is now time for summer breeders such as bullfrogs to lay their eggs.  The early spring breeders such as wood frogs lay large globular clusters of eggs communally in a sunny area of the pond to elevate the temperature for development.  In contrast, bullfrogs lay a thin surface sheet of eggs and jelly from one female which maximizes the oxygen available in warm water and leads to quick hatching.   Warm rains encourage the movement of the terrestrial phase of the aquatic red spotted newt, the red eft.   These brilliantly colored salamanders are advertising that they are very toxic due to the presence of tetrodotoxin in their tissues. 

Bullfrog embryos in pond

Red eft salamander

Bright colors in a male box turtle, however, seem to be instead a species identification mechanism.  Although there is an anecdotal report that box turtles can be toxic after they have eaten poisonous toadstools.

Box turtle male

Many birds have completed raising one brood already, perhaps the case with this mockingbird nest with three hungry babies on June 18.   So the rush to reproduce in some species continues at a frantic pace.

Mockingbird babies in nest

Middle June symbolizes the end of the springtime magic of wildflowers and overwhelming bird song.  Get ready for the long hot summer of equally exciting but different natural wonders.

Bill Dunson
Galax, VA and Englewood, FL