For many years the molecular sequences in the bat genome have not been cooperating, and recent research continues to confirm these findings. If evolution is true, then we must believe that the incredible echolocation ability found in some bats arose multiple times, by evolving independently. That's not easy for evolutionists to explain. How could such uncanny design details repeat themselves via blind biological variation (no, natural selection doesn't help)?
On the other hand, perhaps instead of evolving independently, it only evolved once long ago, and then repeatedly was lost in particular lineages. That's another puzzle. If it was valuable enough to be selected, then why would it later disappear?
But of course if one believes in evolution, then problems such as these are minor. In fact, they are easy to explain. Echolocation evolved repeatedly due to similar environmental pressures. Or, on the other hand, echolocation could have been lost in different lineages due to shifts in environmental pressures. See, nothing in biology makes sense except in the light of evolution.