photo.jpg

## Mamíferos 1. **Characteristic that gives mammals their name:** Mammals are named for their mammary glands. They use these to feed their young with milk. 2. **Comparing the structure of wings:** * **Evolutionary origin**: Bats and birds have wings that evolved from different ancestor...

## Mamíferos 1. **Characteristic that gives mammals their name:** Mammals are named for their mammary glands. They use these to feed their young with milk. 2. **Comparing the structure of wings:** * **Evolutionary origin**: Bats and birds have wings that evolved from different ancestors. * **Structural Material**: Bats use a membrane of skin stretched out to fly while birds use feathers to cover their bony wings. * **Bones**: Bats have long bones in their fingers, whereas bird fingers are fused and reduced in length. 3. **Dolphins:** Dolphins are mammals, not fish. This is because: * They breath air using lungs. * They give birth to their young and nurse them. * They maintain a constant body temperature. * Their bone structure reflects their terrestrial origins. 4. **Whales:** Whales are mammals. They need to surface to breathe air using their lungs. This is different from fish who get their oxygen from the water.