This is an incomplete question. What type of bird ? Does the mother hen return after 3 days. Normally no mother bird would do that .
If it is many days over 21 days, these eggs are infertile and will not hatch. Though it will initially cause the mother some distress, you must throw the eggs out.
The male has no part in the rearing of a young platypus. The female will not willingly leave the young behind. She is a dutiful mother, going without food and waters while incubating the eggs and in the early days after the eggs have hatched.
Ocelots are born live, not in eggs. A mother is pregnant for about 80 days.
approcimatly 21 days
Platypuses are one of only two types of mammals to lay eggs. Fertilised platypus eggs stay in the mother's body for around 28 days. The egg is incubated by the mother curling around it and keeping it warm and dry in the chamber of the burrow for another 10 days.
Platypuses are one of only two types of mammals to lay eggs. Fertilised platypus eggs stay in the mother's body for around 28 days. The egg is incubated by the mother curling around it and keeping it warm and dry in the chamber of the burrow for another 10 days.
They stay in the eggs for about thirty-five days.
Fertilised platypus eggs stay in the mother's body for around 28 days. The egg is incubated by the mother curling around it and keeping it warm and dry in the chamber of the burrow for another 10 days.
Most ducks incubate and hatch their eggs in about 28 days. If your duck has been sitting on her eggs for 5 or more weeks, the eggs are likely infertile. If this is the case, you should remove the infertile eggs so the mother duck can get back to feeding and exercizing.
If a person touched them or something scared her away from her nest. Also if the eggs havent hatched after 28-30 days, the mother will give up on them.
Platypuses do not give birth to live young. They are one of only two types of mammals to lay eggs. Fertilised platypus eggs stay in the mother's body for around 28 days. When they are laid, they incubate for another ten days before hatching.
Blue tailed skink females will stay with their eggs to protect them and then leave after they hatch from one to two days.