Poroelastic materials are commonly found in nature; birds are covered with all sorts of feathers, land animals are covered with different kinds of fur and fishes are covered with various fins and scales. The problem of fluid flow through such materials is very challenging both experimentally and numerically. It is impossible to experimentally measure fluid flow within the material, if the media is densely packed and have fine micro-structure. In such case, direct numerical simulations of the coupled problem with flow in the media and deformation of micro-structure are extremely costly. In order to overcome this limitation, continuum theories have been developed, where average behaviour of the poroelastic material and the fluid within is described. There have already been a significant progress towards describing poroelastic materials similar to examples found in nature; however further work to resolve issues in boundary conditions, modelling and connection between different theories is required. In the current paper, we present a summary of existing theories. Then, we select a multi-scale expansion approach, which we believe is feasible to use for description of the flow in a poroelastic material. Finally, we present preliminary results of a decoupled micro-scale problem with an expansion for two scales. We observe that the two-scale approach is problematic for poroelastic coatings of micro-structure, which is disconnected in a given plane.