A Canada goose and greater white-fronted goose caused quite a stir when the two paired up, mated, and created a nest of eggs together.

See the best animal photos of 2018. Get up close to a shark feeding frenzy and meat-eating bats in these amazing pictures selected by National Geographic editors. By Natasha Daly.

"Give it time." Scientists issue stark warning after harmful creatures breed to form hybrid species: 'We have confirmed the ...

A horde of mysterious "hybrid creatures" is wreaking havoc across California's wilderness. Where did they come from, and why are they considered so dangerous?