December and January are typically the months when seasonal pools begin to fill up. As the ground saturates and water levels rise, the California tiger salamanders come out of their dry season hides and seek out ponds for breeding.
The females lay single eggs and the males come along behind them to make them fertile. The eggs are laid singly, but sometimes so close to each other that they appear to be in the same gel. Here are a few photos of this seasons crop.
(double click to enlarge for closer look)
Sometimes, when eggs are laid next to each other, the gel almost combines giving the appearance that more that one egg was laid in a single mass of gel.