Keepers at the Columbus Zoo say this spring Irisa had bred before but never conceived . However , ten-year-old it was found the female cat was pregnant . While the birth on Tuesday went smoothly , Irisa failed to show any maternal care so her offspring are being hand-reared in an incubator . They currently weigh 2.5lbs but are set to grow to a heftier 650lbs .
Keepers at the Columbus Zoo say ten-year-old Irisa had bred before but never conceived . However , this spring it was found the female cat was pregnant . While the birth on Tuesday went smoothly , Irisa failed to show any maternal care so her offspring are being hand-reared in an incubator . They currently weigh 2.5lbs but are set to grow to a heftier 650lbs .