B.C. Frogwatch Program

How Many Were There?

Estimating the numbers of amphibians present can be a tricky task. Because populations of frogs and toads can fluctuate widely from year to year, it may not even be that important to know exactly how many there are. It's useful, though, to have some idea of approximate numbers and how those may change from year to year.

If you come across amphibian eggs, and you can tell which species they belong to (this is very difficult, so be careful!), record the number of egg masses.

If you see adult animals, record the number you see in the "number" section.

If you are listening to calling frogs or toads, use the following codes on the wildlife sighting form in the "activity" section:

Under "Number", enter "00" (because you didn't see the frogs)

Under "Des", enter "H" for heard

Under "No.", enter:

T: if no frogs are heard
L: if individuals can be counted, calls not overlapping
M: if some individuals can be counted, other calls overlapping
H: if there is a full chorus, calls continuous and overlapping, individuals not distinguishable

Enter the time of day in the "Comments" box.

This is a standard method that allows comparison with other surveys in other areas.

Photo © Heather Waye. No reproduction or distribution without permission.