How do scientists monitor the populations of the threatened California red-legged frog? With careful listening and a little ...

Each clutch can contain up to 20,000 eggs, and some females produce two clutches per summer. In four to five days, the eggs hatch and the tadpoles begin feeding on algae and growing quickly.

Bullfrogs lay between 8,000-120,000 eggs, but typically an average of 20,000 eggs, while native frogs tend to lay many less eggs (e.g., the native red-legged frog lays an average of 5,000).

CLYDE McMILLAN-GAMBER Aug 28, 2011 Updated Sep 12, 2013 ...

A single female can lay anywhere from 15,000 to 40,000 eggs at one time. (Compare that to the endangered Sierra Nevada yellow-legged Frog that usually only lays 100 to 350 eggs in a clutch.) ...

Female frogs lay more than 20,000 tiny eggs at a time and often produce two clutches in a summer. The eggs form a single mat on the water and hatch four days after laying. The larval stage, known ...

When 8-year-old Ava Calsbeek spotted some wood frog eggs in a pond near her family’s home in Hanover, she noticed they were black on one side and white on the other. Ava showed her dad, Ryan ...