By CVC’s Meagan Ruffini, Marketing and Communications Associate

Have you ever come across a strange mass in a wetland or pond and wondered: “What on earth is this!?” We’re here to help you solve the mystery once and for all.

Many amphibians breed in spring and summer and leave behind a strange goo. This goo is actually an egg mass! It’s easy to identify who’s eggs they are once you learn their characteristics.

Frog egg masses are made up of clusters of clear eggs. You can see the embryo of a developing tadpole inside each egg. Eggs protect developing tadpoles from predators and the elements. If you’re a fan of bubble tea, the texture could be compared to a bowl of tapioca balls!


Frog Eggs

How do you know if you’re looking at frog or toad eggs? Frog egg masses are generally round or oval. Toad egg masses are laid in long strings along plants or on the bottoms of shallow water in ponds. No other amphibian in our watershed produces egg masses in this shape. Sometimes sediment settles on toad egg masses, covering individual eggs making them look like giant worms!


Toad Eggs

In the Credit River Watershed, mole salamander egg masses are most likely to be confused with frog egg masses.

Similar to frog eggs, each egg in a salamander’s egg mass has an embryo with a developing salamander. However, salamanders eggs have extra protection. The whole egg mass is enveloped in a thick layer of jelly! The outline of individual eggs isn’t very prominent and you can clearly see two distinct layers in egg masses.


Salamander Eggs

Yellow spotted salamander egg masses have a white, cloudy appearance from certain proteins in the jelly layer. In some cases, you can see a greenish colour from green alga. Recent studies show this unique partnership provides additional oxygen and sugar to the developing salamander embryos, while the algae benefit from salamander waste products. Talk about an unlikely duo!


Yellow Spotted Salamander Eggs

Now that you’re equipped with identification knowledge, put your skills to the test! Can you tell them apart?

The next time you come across a mystery mass in the watershed, share your photo on FacebookTwitter and Instagram and let us know who’s egg you think it is.

Comments (7)

  1. Very interesting actually I saw them.
    BTW as a resident lives by the Rattray Marsh I just noticed people throw the coffee cups or water bottles to the pond. Any action can be taken to stop that. We don’t want to see garbage in our backyard.

  2. Gemma we live by island lake conservation area and see the garbage all the time.
    Would like to volunteer to assist in kindly asking visitors during peak times to hang on to garage until the are able to dispose of it.

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