Posts Tagged ‘nictitating membrane’

Amplexus

March 22, 2016

Amplexus is the nexus between male and female frogs and toads that results in fertilization of eggs. Many mating pairs of Eastern American Toads (Anaxyrus americanus) were observed in amplexus in a vernal pool located along the Hike-Bike Trail at Huntley Meadows Park on 11 March 2016.

The first photo shows a mating pair in amplexus plus another male interloper.

A mating pair of Eastern American Toads (Anaxyrus americanus) plus another male interloper spotted at Huntley Meadows Park, Fairfax County, Virginia USA. The mating pair is in amplexus.

And action! The following photo — my favorite in the set — shows another mating pair in amplexus plus an aggressive male interloper. Notice the strings of toad eggs in the water.

A mating pair of Eastern American Toads (Anaxyrus americanus) plus another male interloper spotted at Huntley Meadows Park, Fairfax County, Virginia USA. The mating pair is in amplexus. Notice the long strings of toad eggs in the water.

Look closely at the full-size version of the preceding photo. Notice the nictitating membrane covering the eyes of all three toads — a translucent third eyelid that protects the eyes of toads when they are underwater. Looking at the other three photos, can you tell which toads’ eyes are (or were) below water?

The next photo shows a mating pair in amplexus. Notice the long strings of toad eggs in the water.

A mating pair of Eastern American Toads (Anaxyrus americanus) spotted at Huntley Meadows Park, Fairfax County, Virginia USA. This pair is in amplexus. Notice the long strings of toad eggs in the water.

The last photo shows another mating pair in amplexus.

A mating pair of Eastern American Toads (Anaxyrus americanus) spotted at Huntley Meadows Park, Fairfax County, Virginia USA. This pair is in amplexus.

Answer Key: Photo 1) The male interloper is under water. Photo 2) All three toads are under water. Photo 3) Both toads are under water. Photo 4) Both toads are above water.

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Copyright © 2016 Walter Sanford. All rights reserved.


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