Indicating two length groups within which individuals are most abundant, possibly with other less abundant length groups around them.

A frequency distribution with two peaks (modes).

a frequency distribution with two modes or high points

In which observations are displayed as having two distinct peaks.

A statistical distribution having two modes.

In statistics, a bimodal distribution is a continuous probability distribution with two different modes. These appear as distinct peaks (local maxima) in the probability density function, as shown in Figure 1.