Yellow Toads in Rio Viejo, Puriscal

Rio Viejo, Puriscal
I had a first and unusual nature sighting yesterday morning. I saw hundreds of small yellow toads in and around the river. Their loud croaking noise first caught my attention then I realized there were tons of these toads swimming in the river and hanging out on the rocks. I saw some mating and I imagine they were all trying to find the females. The loud toad noises went quite far down river. I have never seen anything like this in our river. I am planning to go back this morning with the camera to see if any are left for me to photograph.