Question

Biology (Animal Science)

Please help, stuck on these 3 Q's:

1. Mammary glands are thought to have evolved from what kind of glands?
2. Why is the Dayak bat an unusual mammal?
3. What is aposematic coloration? Give at least two examples.

Answer 1

There are many theories regarding the evolution of "mammary glands". One of the theories believes mammary glands to have evolved from sweat glands.

Dayak is an unusual mammal because in most of the mammals, the females have mammary glands, but Dayak is the only mammal in which the males produce milk.

Aposematic coloration can be defined as conspicuous coloration in animals mainly to warn off predators. The two examples are given below-

1) Bright yellow and black stripes of wasp that serves as aposematic signals.

2) Velvet ants such as Dasymutilla occidentalis have bright colours that serves as aposematic signals.