The bird's heart has 4 chambers.
4
4 chambers
There are 4 chambers in a bird's heart.
A hummingbird has four heart chambers, has do all birds.
A cats heart has four chambers, like humans.
All humans have four chambers in their heart.
BAA (been answered already) - four.
Depends on the species. Three for amphibians and some reptiles, four for mammals and birds. The heart has 4 chambers.
Alligators have a 4 chambered heart, just like birds and mammals
Birds have a 4-chambered heart, a characteristic in common with mammals.
Yes
2 heart chambers just like all other fish, although amphibians and reptiles have only 3 and people and birds have 4
Mammals, birds, and crocodilians have a four-chambered heart.
There are 4 chambers to the heart.