A hummingbird has four heart chambers, has do all birds.
A hummingbird will only lay 1 to 2 tiny, pea sized white eggs. Three babies are too many for the female hummingbird to take care of.
5 chambers
three
8 chambers!
Two chambers.
there are four chambers!
The bird's heart has 4 chambers.
3 bones
four chambers
They have two chambers.
A snails heart has 2 chambers.
Sharks have 2 chambers