I lost a duck ‘ that left me with one. I got 2 ducklings, now 7 weeks old. The ducklings are getting in the pond & staying there. I cannot get them out at night- they stay out all night. They will not follow the older duck to the bed at night. They will eat of my hand, but will not cone to me. How can I get them to go in at night? They have been outside a couple weeks now & I have only been able to chase them in at night 4 times.