How do frogs protect eggs from being eaten by other animals?
Actually frogs do go to some effort to protect their eggs. A lot of times it comes down to simply hiding their eggs as best as they can. You will sometimes notice eggs in a shallow or offwelling of a stream or pond that is not as easily accessible by fish. This allows the eggs sometime to mature, then when they are stronger swimmers or are beginning to grow their legs they can make their way in to the larger body of water. Some frogs may even physically move them once they are ready for development, or babysit them until metamorphosis if it is within their capabilities. Other frogs might lay eggs above a body of water on tree leaves, in this way they are totally protected from fish and when they hatch and are able to swim, they simply fall out of their egg sacs off the leaves and in to the water. In these species, there has been record of an eggs self defense mechanism from egg eating wasps and bugs, wherein an egg if stimulated by the vibration of said insects, will hatch prematurely
