3 Fails! Cuckoo Can’t Push Chicks Out—Guardrail Works杜鹃鸟3次想把小鸟推出鸟窝，小鸟都逃过一劫，护栏起作用了

All chicks pushed out by the cuckoo retrieved, guardrail installed.找回了所有被杜鹃鸟推出来的小鸟，并且加上护栏

Two Young Turtledoves Grow Up, Flapping Wings Wider2只小斑鸠长大了，振翅幅度越来越大，鸟妈妈辛苦了

A cuckoo pushed the chicks out of the nest. A guy put three back—but missed one.小哥把3只小鸟放回鸟窝里，但漏了1只

Part 29: The Secret of Eastern Grass Owls: How Do Chicks of Different Sizes Survive?

The cuckoo failed. Its blue egg was pecked open and tossed out of the nest by the mother bird.

Baby doves eat more and more—parents rush back nonstop, it’s tough for them!

Part 30: The Secret of Eastern Grass Owls: How Do Chicks of Different Sizes Survive?

Part 28: The Secret of Eastern Grass Owls: How Do Chicks of Different Sizes Survive?

Part 31: The Secret of Eastern Grass Owls: How Do Chicks of Different Sizes Survive?