There are some small differences including the shape of our teeth and the thickness of our skin but the easiest way to tell the difference between a male and female catshark (or any cartilaginous fish) is that males have ‘claspers’. Claspers are paired, elongated sex organs which grow from their pectoral fins used to deposit sperm into the females cloaca. When viewed from below it is hard to miss a male catshark!
Adult male Emperor Dragonflies are mostly electric blue, and adult femailes are mostly bright green. You ca see some brilliant picture at this website: https://british-dragonflies.org.uk/species/emperor-dragonfly – there is a female at top left of the picture gallery and a male in the middle row on the right…
My scientist DREAMS of taking pictures this good!
In general, male and female cranes are quite similar. However, females tend to be slightly smaller in body/wing size, while males have smaller beaks (almost twice as small!). When it comes to taking care of the progeny, both male and female take responsibility. For example, if there are two eggs, the first chick that hatches can be cared for by the female, while the male incubates the second egg.