Some of the casualties are natural, like turtle hatchlings dropped by gulls onto a construction site.

FORBES: Magazine Article

Staff said that the new arrival does not necessarily mean Lady will rear four new hatchlings.

BBC: Lady in nest

Last August thousands of leatherback eggs and hatchlings were crushed by bulldozers moving waterlogged sand from key nesting areas.

BBC: New law to protect Puerto Rico leatherback turtles

Someday, though, Goudey pictures a mobile fish farm that could work like this: Put hatchlings in cages into a Caribbean gyre near Barbados.

FORBES: Breakthroughs

However, even with 2010's 13 hatchlings, it will take a long time to see a substantial boost in numbers because each Siamese crocodile takes at least 15 years to reach sexual maturity.

BBC: A Fauna & Flora project hopes to save a rare crocodile

Most of the hatchlings were released into the ocean.

CNN: Turtle eaters develop taste for conservation

Furthermore, because both female turtles and their hatchlings navigate their way to the ocean using the bright moonlight reflecting off the breaking surf, artificial lights could disorientate them and send them towards danger.

CNN: Race to save the leatherback turtle

The herons took both eggs and hatchlings.

ECONOMIST: Animal behaviour

Scientists drained some fish of their sperm or eggs, which were later fertilized to create hatchlings to reintroduce or support the fish in other parts of their ancient range in the Great Lakes, Hudson Bay and Mississippi basins.

WSJ: Standing Guard for the Sturgeon