Eggs decrease slightly in size from laying to hatching. The eggs are kept in incubators to aid in their hatching. Both parents feed the chicks live prey from hatching to fledging. Neem also suppresses the hatching of pest insects from their eggs. Egg hatching and fingerling survival are affected. The parents begin incubating soon after the first egg is laid leading to asynchronous hatching. The first brood consists of adults with a spring hatching around April. The chicks are precocial and able to leave the nest soon after hatching. The adults inject the eggs into a host, which they begin to consume after hatching. These eggs are swelled with perivitelline fluid (PVF), a hypertonic fluid that prevents premature hatching. It commonly occurs in falconry birds reared from hatching by humans. Herpo made this discovery by hatching a chicken egg under a toad. This ensures that the embryo will not suffocate while it is hatching. Chicks are brooded by the adults for the first ten days after hatching. The time between the egg hatching and water entry is 21 days.