If your birdbath is off the ground then you most certainly have Tree Frog Eggs! I am so jealous! The problem with leaving them in the bird bath is the birds will destroy and eat the new tadpoles. ALSO... the fish will eat tree frog tadpoles as well sometimes as they are not toxic to fish like toad tadpoles. If you have a small 20 gallon container you can put them in and get alage growth (in the sun) that would be fantastic for them.

futureprodigy, When you're through with your demonstration of frog development, keep the adults in an aquarium or kill them. Please don't release them. The places I know that sell frogs eggs, sell them for educational purposes only. They're not meant for stocking ponds and are not screened for diseases. Not unlike the little turtles that are illegal to personally own because of the health risk, but still can sold for educational purposes. Also, the species of frog eggs you receive may or may not be what you ordered. The companies will substitute depending on availability. Usually this is stated somewhere in fine print but not always since the "product" is meant for educational purposes. You might very well receive eggs from a species not native to your area.

I copied this as it was easier than typing it out. It applies to Ohio but should be good for Illinois as well. "The woodfrog is an example of an explosive breeder, a species that congregates in large numbers at breeding ponds for a very short mating season lasting only two or three days to a week. They become active in mid-March and remain so until late October. Spawning is accomplished in small temporary pools, swamps, or semipermanent ponds and takes place from mid-March to early April in northeastern Ohio. Woodfrogs often lay their clutches of eggs aggregated in a central location of the pond thereby forming huge rafts of eggs deposited below the surface of the water. Individual egg masses are globular in shape and measure 75-100 mm in diameter. Each mass may contain 1000-5000 eggs with each egg swelling to 6-7 mm in diameter upon hydration. The eggs hatch in 14-21 days, and transformation occurs 61-115 days following spawning. Woodfrog tadpoles are dark, nearly black, and transform the year they hatch at lengths of 38-48 mm. Recently transformed woodfrogs 15-18 mm in length may be found from early June through late July. Sexual maturity is reached in two years." Here is a link that might be useful: Frogpatch Where kids and adults learn nature

I got some before from Willow Farms when they were selling them and they just put them in a plastic bag with water and shipped them priority mail. They all came alive.