Which of the following is not characteristic of birds? (a) hollow bones (b) amnion (c) ectotherm

Which of the following is not characteristic of birds? (a)...

Key Concepts

Bone Adaptations

Birds have evolved hollow bones that reduce body weight without significant loss of strength, an adaptation essential for the demands of flight and maneuverability.

Thermoregulation

Birds are endothermic, meaning they regulate their body temperature internally through metabolic processes; this contrasts with ectothermy, where external sources are used to control body temperature.

Amniotic Egg

The presence of an amnion in the egg is a key evolutionary adaptation among amniotes, including birds, allowing embryonic development in a controlled aquatic environment within the egg.

Metabolic Rate

A high metabolic rate is typical among birds, providing the necessary energy for sustained flight and other active behaviors, distinguishing them from many ectothermic species.

Scale Morphology

While birds possess scales on parts of their legs, these structures are evolutionary remnants shared with reptiles and are adapted differently compared to typical reptilian scales.

Transcript

00:01 Birds vary in size greatly from the tiny hummingbirds or maybe a few inches in length and a few grams to the albatross, which can have an 11 -foot wingspan and weigh almost 20 pounds.

00:17 So think about that.

00:18 If you have to see this pelican here weighs about 10 pounds, and you still have to get that into the air.

00:25 So how are birds adapted for flight? and everything about them is going to be adapted for flight.

00:32 One thing is that they really want to maintain as light of a weight as possible, and they do that in two ways.

00:39 First of all, they have very hollow bones, and having hollow bones and not filled with any kind of fluid or other substance, give them a lot of lightness.

00:50 And also that high metabolic rate, now how can the high metabolic rate make them way less? well, everything that goes into them, they're very fast, they're just a tract.

01:00 So everything that goes into them is going to be extruded as waste within a few minutes.

01:06 I mean, i've seen people with a bird, a pet bird sitting on their shoulder, and while they're feeding them, their waste products are coming back out the other end.

01:15 So they have a very fast digestive system in a very high metabolic rate.

01:20 Now, i've had a high metabolic rate in addition to being great for maintaining a low, weight.

01:27 It's also going to give them the energy that they need for flight.

01:30 So birds need that high energy for flight as well as the lightness in order to carry that on.

01:40 They also don't carry eggs with them.

01:43 So none of them are over by vaporous.

01:46 None of them keep eggs inside their body until they hatch.

01:49 They all have to lay eggs on land.

01:51 And they have to lay an egg on land that is fit for being on land and certainly for not drying out the land, the eggs on land with the amnode egg...

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