Three female and one male chicks were hatched in April 2009.

"After all, what male would not sing, when his captors threatened to torture his mate and female chicks if he refused?"

Adult females with poor nest hollows often commit infanticide on the male, if they produce both a male and a female chick.

This finding was subsequently used to increase the number of female chicks by deliberately manipulating maternal condition.

The female chick was named "Tango" by the zookeepers.

If there's no male, the eggs may hatch anyway-but only female chicks.

On average, a male chick will first fly around 10 days earlier than a female chick.

The lawyer in question referred to female co-workers as "crazy single female chicks" who "just need[ed] a good **** to get them back to normal".

The female chick was cautious, taking short test flights to nearby branches.

Nuli (performer: Ayelet Levin / Tzlila Yanai) - a female chick.