Department of Energy Argonne National Laboratory Office of Science NEWTON's Homepage NEWTON's Homepage
NEWTON, Ask A Scientist!
NEWTON Home Page NEWTON Teachers Visit Our Archives Ask A Question How To Ask A Question Question of the Week Our Expert Scientists Volunteer at NEWTON! Frequently Asked Questions Referencing NEWTON About NEWTON About Ask A Scientist Education At Argonne Avian Reproduction
Name: Jim
Status: other
Age: other
Location: LA
Country: N/A
Date: 3/30/2005


Question:
My question relates to the Eastern Screech Owl. How are their eggs fertilized? Does his sperm have to penetrate an egg shell or is the shell formed after mating/fertilization? If the shell is formed after, how long does it take to form and how long after mating will the egg be laid? Must the pair mate once for every egg laid or may the usual clutch of three eggs be fertilized after one mating?


Replies:
In general reproduction in birds follows this pattern: during copulation semen and sperm are put in the female's cloaca, from which sperm swim up the oviduct and fertilize the eggs. Shells form as the eggs develop, and fully formed eggs may be laid by the female within a few days. A clutch of eggs may come from a single or more than one mating. I don't have specific information on screech owls but they follow the basic pattern.

J. Elliott


Click here to return to the Zoology Archives

NEWTON is an electronic community for Science, Math, and Computer Science K-12 Educators, sponsored and operated by Argonne National Laboratory's Educational Programs, Andrew Skipor, Ph.D., Head of Educational Programs.

For assistance with NEWTON contact a System Operator (help@newton.dep.anl.gov), or at Argonne's Educational Programs

NEWTON AND ASK A SCIENTIST
Educational Programs
Building 360
9700 S. Cass Ave.
Argonne, Illinois
60439-4845, USA
Update: June 2012
Weclome To Newton

Argonne National Laboratory